Standard Lemma guide

slack

adj · adv · name · noun · verb · 46 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /slæk/
  • Australia: Recorded audio is listed in the source snapshot.
  • rhymes with -æk
  • CMU ARPABET: S L AE1 K Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Lax; not tense; not firmly extended.

Definition source: English Wiktionary via Wiktextract

Examples

  • a slack rope

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

Weak; not holding fast.

Definition source: English Wiktionary via Wiktextract

Examples

  • a slack hand

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adj

Meaning 3

Moderate in some capacity.

Moderately warm.

Definition source: English Wiktionary via Wiktextract

Examples

  • a slack oven

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

adj

Meaning 4

Moderate in some capacity.

Moderate in speed.

Definition source: English Wiktionary via Wiktextract

Examples

  • a slack wind

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

adj

Meaning 5

Lacking diligence or care; not earnest or eager.

Definition source: English Wiktionary via Wiktextract

Examples

  • slack in duty or service

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

adj

Meaning 6

Not active or busy, successful, or violent.

Definition source: English Wiktionary via Wiktextract

Examples

  • Business is slack.
  • the slack period following the main tourist season

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

adj

Meaning 7

Excess; surplus to requirements.

Definition source: English Wiktionary via Wiktextract

Examples

  • the slack capacity of an oil pipeline

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

adj

Meaning 8

Vulgar; sexually explicit, especially in dancehall music.

Definition source: English Wiktionary via Wiktextract

Usage: Caribbean, Jamaica, slang

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

9

adj

Meaning 9

Lax.

Definition source: English Wiktionary via Wiktextract

Topics: human-sciences, linguistics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

10

adv

Meaning 10

Slackly.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Examples

  • slack dried hops
  • Her clothes hung slack on her.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

11

name

Meaning 11

A surname.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

12

name

Meaning 12

A place in England:

A hamlet in Ashover parish, North East Derbyshire district, Derbyshire (OS grid ref SK3362).

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

13

name

Meaning 13

A place in England:

A hamlet in Heptonstall parish, Metropolitan Borough of Calderdale, West Yorkshire (OS grid ref SD9828).

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

14

name

Meaning 14

A place in England:

A hamlet in the Metropolitan Borough of Kirklees, near Outlane, West Yorkshire (OS grid ref SE0817).

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

15

name

Meaning 15

A real-time collaboration app and platform launched in 2013.

Definition source: English Wiktionary via Wiktextract

Usage: Internet, countable, uncountable

Topics: computing, engineering, mathematics, natural-sciences, physical-sciences, sciences, software

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

16

noun

Meaning 16

The part of anything that hangs loose, having no strain upon it.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Examples

  • the slack of a rope or of a sail
  • take in the slack

Meaning relationships

Synonyms: none provided

Antonyms: none provided

17

noun

Meaning 17

A dip in a surface.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

18

noun

Meaning 18

In particular, a shallow dell or hollow; a dip in the surface of terrain, such as between hills.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

19

noun

Meaning 19

A low-lying marsh or a pool, especially a tidal or intermittent one which periodically fills and drains.

Definition source: English Wiktionary via Wiktextract

Usage: countable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

20

noun

Meaning 20

Unconditional listening attention given by client to patient.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Qualifier: psychotherapy

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

21

noun

Meaning 21

Attributive form of slacks (“semi-formal trousers”).

Definition source: English Wiktionary via Wiktextract

Usage: attributive, countable, form-of, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

22

noun

Meaning 22

A temporary speed restriction where track maintenance or engineering work is being carried out at a particular place.

Definition source: English Wiktionary via Wiktextract

Topics: rail-transport, railways, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

23

noun

Meaning 23

A valley, or small, shallow dell; a sag or saddle in a ridge.

Definition source: English Wiktionary via Wiktextract

Usage: countable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

24

noun

Meaning 24

A flat-bottomed, hollow zone within a sand-dune system that has developed over impervious strata, sometimes due to erosion or blow-out of the dune system; its flat base level is therefore close to or at the permanent water-table level, and therefore has rich, marshy flora, with Salix species (willows) as typical woody colonisers.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

25

noun

Meaning 25

Small coal; coal dust.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: business, mining

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: culm

Antonyms: none provided

26

verb

Meaning 26

To slacken.

Definition source: English Wiktionary via Wiktextract

Usage: ambitransitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

27

verb

Meaning 27

To mitigate; to reduce the strength of.

Definition source: English Wiktionary via Wiktextract

Usage: obsolete

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

28

verb

Meaning 28

To lose cohesion or solidity by a chemical combination with water; to slake.

Definition source: English Wiktionary via Wiktextract

Examples

  • Lime slacks.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

29

verb

Meaning 29

To refuse to work as hard as one is supposed to.

Definition source: English Wiktionary via Wiktextract

Examples

  • I can't afford to slack. This job is all I have!

Meaning relationships

Synonyms: none provided

Antonyms: none provided

30

adjective satellite

Meaning 30

lacking in rigor or strictness

Definition source: Princeton WordNet 3.0

Examples

  • such lax and slipshod ways are no longer acceptable
  • lax in attending classes
  • slack in maintaining discipline

Meaning relationships

Synonyms: lax

Antonyms: none provided

31

adjective satellite

Meaning 31

flowing with little speed as e.g. at the turning of the tide

Definition source: Princeton WordNet 3.0

Examples

  • slack water

Meaning relationships

Synonyms: none provided

Antonyms: none provided

32

adjective satellite

Meaning 32

not tense or taut

Definition source: Princeton WordNet 3.0

Examples

  • the old man's skin hung loose and grey
  • slack and wrinkled skin
  • slack sails
  • a slack rope

Meaning relationships

Synonyms: loose

Antonyms: none provided

33

noun

Meaning 33

a cord or rope or cable that is hanging loosely

Definition source: Princeton WordNet 3.0

Examples

  • he took up the slack

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: cord

34

noun

Meaning 34

the quality of being loose (not taut)

Definition source: Princeton WordNet 3.0

Examples

  • he hadn't counted on the slackness of the rope

Meaning relationships

Synonyms: slackness

Antonyms: none provided

Broader terms: looseness, play

35

noun

Meaning 35

a soft wet area of low-lying land that sinks underfoot

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: mire, quagmire, quag, morass

Antonyms: none provided

Broader terms: bog, peat bog

36

noun

Meaning 36

a stretch of water without current or movement

Definition source: Princeton WordNet 3.0

Examples

  • suddenly they were in a slack and the water was motionless

Meaning relationships

Synonyms: slack water

Antonyms: none provided

Broader terms: stretch

37

noun

Meaning 37

a noticeable deterioration in performance or quality

Definition source: Princeton WordNet 3.0

Examples

  • the team went into a slump
  • a gradual slack in output
  • a drop-off in attendance
  • a falloff in quality

Meaning relationships

Synonyms: slump, drop-off, falloff, falling off

Antonyms: none provided

Broader terms: deterioration, decline in quality, declension, worsening

38

noun

Meaning 38

dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: debris, dust, junk, rubble, detritus

39

verb

Meaning 39

cause to heat and crumble by treatment with water

Definition source: Princeton WordNet 3.0

Examples

  • slack lime

Meaning relationships

Synonyms: slake

Antonyms: none provided

Broader terms: hydrate

Narrower terms: air-slake

40

verb

Meaning 40

become less in amount or intensity

Definition source: Princeton WordNet 3.0

Examples

  • The storm abated
  • The rain let up after a few hours

Meaning relationships

Synonyms: abate, let up, slack off, die away

Antonyms: none provided

Broader terms: decrease, diminish, lessen, fall

41

verb

Meaning 41

make less active or intense

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: slake, abate

Antonyms: none provided

Broader terms: decrease, lessen, minify

42

verb

Meaning 42

become slow or slower

Definition source: Princeton WordNet 3.0

Examples

  • Production slowed

Meaning relationships

Synonyms: slow, slow down, slow up, slacken

Antonyms: none provided

Broader terms: weaken

43

verb

Meaning 43

make less active or fast

Definition source: Princeton WordNet 3.0

Examples

  • He slackened his pace as he got tired
  • Don't relax your efforts now

Meaning relationships

Synonyms: slacken, slack up, relax

Antonyms: none provided

Broader terms: decrease, lessen, minify

44

verb

Meaning 44

release tension on

Definition source: Princeton WordNet 3.0

Examples

  • slack the rope

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: loosen, loose

45

verb

Meaning 45

be inattentive to, or neglect

Definition source: Princeton WordNet 3.0

Examples

  • He slacks his attention

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: neglect

46

verb

Meaning 46

avoid responsibilities and work, be idle

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: fiddle, shirk, shrink from, goldbrick

History

Etymology

From Middle English slak, from Old English slæc (“slack”), from Proto-Germanic *slakaz. For sense of coal dust, compare slag.

* As an English and Dutch surname, from the adjective slack. * Also as an English surname, from the noun slack (“shallow valley”). * Possibly also a Slovene surname Americanized from slak (“bindweed”), from Proto-Slavic *sъvolkъ. * The name of the software is an acronym of Searchable Log of All Conversation and Knowledge.

Either from the adjective in Etymology 1 or the verb in Etymology 2.

From Middle English slak, from Old Norse slakki (“a slope”). Cognate with Icelandic slakki, Norwegian slakke.

Of unknown origin. Possibly related to Middle Dutch slacke or Middle Low German slecke. Doublet of slag.

From Middle English slakken, slaken, from Old English slacian, from Proto-Germanic *slakōną (“to slack, slacken”).

Across languages

Translations

130 source translations are retained for this English entry.

  • Bashkir: бушаҡ (buşaq) — not tense
  • Belarusian: рассла́блены (rasslábljeny) — not tense
  • Bulgarian: вял (vjal) — not tense
  • Bulgarian: отпуснат (otpusnat) — not tense
  • Dutch: slap — not tense
  • Finnish: löysä — not tense
  • French: lâche — not tense
  • German: schlaff — not tense
  • German: lose — not tense
  • Ancient Greek: λαγαρός (lagarós) — not tense
  • Hungarian: laza — not tense
  • Hungarian: ernyedt — not tense
  • Italian: allentato — not tense
  • Latin: laxus — not tense
  • Macedonian: ла́бав (lábav) — not tense
  • Māori: pūngohe — not tense
  • Māori: tatetate — not tense
  • Māori: korokoro — not tense
  • Māori: tāngengangenga — not tense
  • Māori: kōrurururu — not tense
  • Māori: kaewa — not tense
  • Māori: māwāwā — not tense
  • Māori: ngoru — not tense
  • Khiamniungan Naga: tâng — not tense
  • Plautdietsch: schlaup — not tense
  • Polish: rozluźniony — not tense
  • Russian: рассла́бленный (rassláblennyj) — not tense
  • Russian: ненатя́нутый (nenatjánutyj) — not tense
  • Serbo-Croatian: labavo — not tense
  • Serbo-Croatian: opušteno — not tense
  • Spanish: flojo — not tense
  • Spanish: holgado — not tense
  • Spanish: suelto — not tense
  • Turkish: gevşek — not tense
  • Ottoman Turkish: گوشك (gevşek) — not tense
  • Ukrainian: розсла́блений (rozsláblenyj) — not tense
  • Bulgarian: слаб (slab) — weak
  • Dutch: week — weak
  • Finnish: veltto — weak
  • German: schlaff — weak
  • Macedonian: слаб (slab) — weak
  • Portuguese: frouxo — weak
  • Russian: сла́бый (slábyj) — weak
  • Serbo-Croatian: mlohavo — weak
  • Spanish: flojo — weak
  • Bulgarian: небрежен (nebrežen) — not using due diligence or care
  • Dutch: slecht gemaakt — not using due diligence or care
  • Finnish: huolimaton — not using due diligence or care
  • German: trödelig — not using due diligence or care
  • German: schlampig — not using due diligence or care
  • German: lasch — not using due diligence or care
  • Irish: leibideach — not using due diligence or care
  • Macedonian: не́брежен (nébrežen) — not using due diligence or care
  • Māori: pirorehe — not using due diligence or care
  • Māori: waimate — not using due diligence or care
  • Russian: небре́жный (nebréžnyj) — not using due diligence or care
  • Scottish Gaelic: dìomhain — not using due diligence or care
  • Ottoman Turkish: گوشك (gevşek) — not using due diligence or care
  • Ottoman Turkish: طمرسز (damarsız) — not using due diligence or care
  • Dutch: tam — not rapid or pressing
  • Finnish: hiljainen — not rapid or pressing
  • Bulgarian: вяло (vjalo) — adverb of slack
  • Bulgarian: отпуснато (otpusnato) — adverb of slack
  • Finnish: löysästi — adverb of slack
  • Finnish: veltosti — adverb of slack
  • Finnish: huolimattomasti — adverb of slack
  • Bulgarian: провисване (provisvane) — the part of anything that hangs loose
  • Spanish: flojera — the part of anything that hangs loose
  • Spanish: soltura — the part of anything that hangs loose
  • Finnish: kluuvi — tidal marsh or periodically filling shallow
  • German: Marsch — tidal marsh or periodically filling shallow
  • Spanish: charco — tidal marsh or periodically filling shallow
  • Bulgarian: дребни въглища (drebni vǎglišta) — small coal, coal dust
  • Catalan: carbonet — small coal, coal dust
  • Dutch: kolengruis — small coal, coal dust
  • Finnish: hiilipöly — small coal, coal dust
  • Finnish: hiilimurska — small coal, coal dust
  • French: gravier — small coal, coal dust
  • German: Schlacke — small coal, coal dust
  • Italian: carbonella — small coal, coal dust
  • Italian: polverino — small coal, coal dust
  • Macedonian: ја́гленов прав (jáglenov prav) — small coal, coal dust
  • Macedonian: си́тен ја́глен (síten jáglen) — small coal, coal dust
  • Russian: у́гольная пы́ль (úgolʹnaja pýlʹ) — small coal, coal dust
  • Spanish: carbonilla — small coal, coal dust
  • Spanish: carboncillo — small coal, coal dust
  • Spanish: cisco — small coal, coal dust
  • Bulgarian: долчинка (dolčinka) — small shallow dell or valley
  • Finnish: notko — small shallow dell or valley
  • Finnish: notkelma — small shallow dell or valley
  • German: Senke — small shallow dell or valley
  • Finnish: löysä — loose part of anything
  • Irish: ligean — loose part of anything
  • Russian: слабина́ (slabiná) — loose part of anything
  • Tagalog: lundo — loose part of anything
  • Bulgarian: отпускам се (otpuskam se) — to procrastinate
  • Bulgarian: безделнича (bezdelniča) — to procrastinate
  • Dutch: treuzelen — to procrastinate
  • Finnish: velttoilla — to procrastinate
  • Finnish: viivytellä — to procrastinate
  • Finnish: vetelehtiä — to procrastinate
  • French: glander — to procrastinate
  • German: trödeln — to procrastinate
  • German: bummeln — to procrastinate
  • German: faulenzen — to procrastinate
  • German: faul sein — to procrastinate
  • Macedonian: се о́пушта (se ópušta) — to procrastinate
  • Macedonian: безде́лничи (bezdélniči) — to procrastinate
  • Macedonian: се вле́чка (se vléčka) — to procrastinate
  • Portuguese: enrolar — to procrastinate
  • Russian: ло́дырничать (lódyrničatʹ) — to procrastinate
  • Russian: безде́льничать (bezdélʹničatʹ) — to procrastinate
  • Russian: сачкова́ть (sačkovátʹ) — to procrastinate
  • Serbo-Croatian: odugovlačiti — to procrastinate
  • Spanish: haraganear — to procrastinate
  • Spanish: flojear — to procrastinate
  • Finnish: löysäillä — to refuse to exert effort
  • German: (anstrengende) Arbeit scheuen — to refuse to exert effort
  • Ancient Greek: βλακεύω (blakeúō) — to refuse to exert effort
  • Māori: tūkeke — to refuse to exert effort
  • Russian: лени́ться (lenítʹsja) — to refuse to exert effort
  • Spanish: aflojarse — to refuse to exert effort
  • Spanish: relajarse — to refuse to exert effort
  • Spanish: estar a la bartola — to refuse to exert effort
  • Spanish: flojear — to refuse to exert effort
  • Spanish: aflojar — to refuse to exert effort
  • Spanish: huevonear — to refuse to exert effort
  • Spanish: huevear — to refuse to exert effort
  • Spanish: güevear — to refuse to exert effort
  • Spanish: güevonear — to refuse to exert effort
Real reading context

slack in complete knowledge articles