Standard Lemma guide

deficient

adj · noun · 7 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.

  • UK: /dɪˈfɪʃənt/
  • US: Recorded audio is listed in the source snapshot.
  • rhymes with -ɪʃənt
  • CMU ARPABET: D IH0 F IH1 SH AH0 N T Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Lacking something essential; often construed with in.

Definition source: English Wiktionary via Wiktextract

Examples

  • They were deficient in social skills.

Meaning relationships

Synonyms: absent, poor in, void of, awanting, bereft of, deficient of, deprived of, destitute of, devoid of, lacking, leer, robbed of, shorn of, stripped of, wanting

Antonyms: none provided

2

adj

Meaning 2

Insufficient or inadequate in amount.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adj

Meaning 3

Of a number n, Having the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n)<n.

Definition source: English Wiktionary via Wiktextract

Topics: mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

A person who is deficient.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

adjective

Meaning 5

of a quantity not able to fulfill a need or requirement

Definition source: Princeton WordNet 3.0

Examples

  • insufficient funds

Meaning relationships

Synonyms: insufficient

Antonyms: none provided

6

adjective satellite

Meaning 6

inadequate in amount or degree

Definition source: Princeton WordNet 3.0

Examples

  • a deficient education
  • deficient in common sense
  • lacking in stamina
  • tested and found wanting

Meaning relationships

Synonyms: lacking(p), wanting(p)

Antonyms: none provided

7

adjective satellite

Meaning 7

falling short of some prescribed norm

Definition source: Princeton WordNet 3.0

Examples

  • substandard housing

Meaning relationships

Synonyms: inferior, substandard

Antonyms: none provided

History

Etymology

From Latin deficiens, present participle of deficere (“to lack, fail, be wanting”); see defect.

Across languages

Translations

46 source translations are retained for this English entry.

  • Bulgarian: несъвършен (nesǎvǎršen) — lacking something essential
  • Bulgarian: с недостатъци (s nedostatǎci) — lacking something essential
  • Catalan: deficient — lacking something essential
  • Finnish: puutteellinen — lacking something essential
  • Galician: deficiente — lacking something essential
  • German: mangelhaft — lacking something essential
  • Ancient Greek: λείπομαι (leípomai) — lacking something essential
  • Indonesian: defisien — lacking something essential
  • Irish: díothach — lacking something essential
  • Irish: uireasach — lacking something essential
  • Irish: easpach — lacking something essential
  • Italian: deficiente — lacking something essential
  • Portuguese: deficiente — lacking something essential
  • Romanian: deficient — lacking something essential
  • Sanskrit: ऊन (ūna) — lacking something essential
  • Spanish: deficiente — lacking something essential
  • Turkish: eksik — lacking something essential
  • Ottoman Turkish: اكسیك (eksik) — lacking something essential
  • Ottoman Turkish: نقصان (noksan) — lacking something essential
  • Ukrainian: недоскона́лий (nedoskonályj) — lacking something essential
  • Ukrainian: позба́влений (pozbávlenyj) — lacking something essential
  • Welsh: diffygiol — lacking something essential
  • Bulgarian: недостатъчен (nedostatǎčen) — insufficient or inadequate in amount
  • Bulgarian: недостигащ (nedostigašt) — insufficient or inadequate in amount
  • Catalan: deficient — insufficient or inadequate in amount
  • Danish: mangelfuld — insufficient or inadequate in amount
  • Dutch: gebrekkig — insufficient or inadequate in amount
  • Dutch: tekortschietend — insufficient or inadequate in amount
  • Finnish: riittämätön — insufficient or inadequate in amount
  • German: defizient — insufficient or inadequate in amount
  • Indonesian: defisien — insufficient or inadequate in amount
  • Māori: pahara — insufficient or inadequate in amount
  • Māori: pūhungahunga — insufficient or inadequate in amount
  • Māori: takarepa — insufficient or inadequate in amount
  • Māori: huka — insufficient or inadequate in amount
  • Romanian: insuficient — insufficient or inadequate in amount
  • Romanian: deficient — insufficient or inadequate in amount
  • Sanskrit: ऊन (ūna) — insufficient or inadequate in amount
  • Spanish: deficiente — insufficient or inadequate in amount
  • Swedish: bristfällig — insufficient or inadequate in amount
  • Turkish: eksik — insufficient or inadequate in amount
  • Turkish: az — insufficient or inadequate in amount
  • Ottoman Turkish: اكسیك (eksik) — insufficient or inadequate in amount
  • Ottoman Turkish: نقصان (noksan) — insufficient or inadequate in amount
  • Ukrainian: недоста́тній (nedostátnij) — insufficient or inadequate in amount
  • Ukrainian: непо́вний (nepóvnyj) — insufficient or inadequate in amount
Real reading context

deficient in complete knowledge articles