Standard Lemma guide

vacillate

verb · 4 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.

  • /ˈvæ.sə.leɪt/
  • /ˈvæ.sɪ.leɪt/
  • US: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: V AE1 S AH0 L EY2 T Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

verb

Meaning 1

To sway unsteadily from one side to the other; oscillate.

Definition source: English Wiktionary via Wiktextract

Usage: intransitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

verb

Meaning 2

To swing indecisively from one course of action or opinion to another.

Definition source: English Wiktionary via Wiktextract

Usage: intransitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

verb

Meaning 3

move or sway in a rising and falling or wavelike pattern

Definition source: Princeton WordNet 3.0

Examples

  • the line on the monitor vacillated

Meaning relationships

Synonyms: fluctuate, waver

Antonyms: none provided

Broader terms: swing

4

verb

Meaning 4

be undecided about something; waver between conflicting positions or courses of action

Definition source: Princeton WordNet 3.0

Examples

  • He oscillates between accepting the new position and retirement

Meaning relationships

Synonyms: hover, vibrate, oscillate

Antonyms: none provided

Broader terms: hesitate, waver, waffle

Narrower terms: shillyshally

History

Etymology

From Latin vacillātum, supine form of vacillō (“sway, waver”). By surface analysis, Latin vacill- + -ate.

Across languages

Translations

60 source translations are retained for this English entry.

  • Bulgarian: люлея се (ljuleja se) — to sway unsteadily from one side to the other
  • Bulgarian: колебая се (kolebaja se) — to sway unsteadily from one side to the other
  • Catalan: vacil·lar — to sway unsteadily from one side to the other
  • Chinese Mandarin: 搖擺不定 /摇摆不定 (yáobǎibúdìng) — to sway unsteadily from one side to the other
  • Czech: kolísat — to sway unsteadily from one side to the other
  • Dutch: wankelen — to sway unsteadily from one side to the other
  • Finnish: horjua — to sway unsteadily from one side to the other
  • Finnish: huojua — to sway unsteadily from one side to the other
  • Finnish: heilua — to sway unsteadily from one side to the other
  • French: vaciller — to sway unsteadily from one side to the other
  • Georgian: რწევა (rc̣eva) — to sway unsteadily from one side to the other
  • Georgian: რხევა (rxeva) — to sway unsteadily from one side to the other
  • Georgian: რყევა (rq̇eva) — to sway unsteadily from one side to the other
  • German: schwanken — to sway unsteadily from one side to the other
  • Greek: ταλαντεύομαι (talantévomai) — to sway unsteadily from one side to the other
  • Italian: vacillare — to sway unsteadily from one side to the other
  • Italian: ondeggiare — to sway unsteadily from one side to the other
  • Italian: oscillare — to sway unsteadily from one side to the other
  • Italian: sbandare — to sway unsteadily from one side to the other
  • Italian: esitare — to sway unsteadily from one side to the other
  • Korean: 흔들리다 (heundeullida) — to sway unsteadily from one side to the other
  • Latin: vacillō — to sway unsteadily from one side to the other
  • Portuguese: vacilar — to sway unsteadily from one side to the other
  • Russian: колеба́ться (kolebátʹsja) — to sway unsteadily from one side to the other
  • Russian: кача́ться (kačátʹsja) — to sway unsteadily from one side to the other
  • Spanish: vacilar — to sway unsteadily from one side to the other
  • Spanish: tambalear — to sway unsteadily from one side to the other
  • Spanish: tambalearse — to sway unsteadily from one side to the other
  • Spanish: trastrabillar — to sway unsteadily from one side to the other
  • Spanish: trastabillar — to sway unsteadily from one side to the other
  • Turkish: sendelemek — to sway unsteadily from one side to the other
  • Turkish: yalpalamak — to sway unsteadily from one side to the other
  • Bulgarian: двоумя се (dvoumja se) — to swing from one course of action or opinion to another
  • Bulgarian: не се решавам (ne se rešavam) — to swing from one course of action or opinion to another
  • Bulgarian: колебая се (kolebaja se) — to swing from one course of action or opinion to another
  • Catalan: vacil·lar — to swing from one course of action or opinion to another
  • Chinese Mandarin: 犹豫不定 — to swing from one course of action or opinion to another
  • Czech: váhat — to swing from one course of action or opinion to another
  • Dutch: weifelen — to swing from one course of action or opinion to another
  • Finnish: horjua — to swing from one course of action or opinion to another
  • Finnish: epäröidä — to swing from one course of action or opinion to another
  • Finnish: soutaa ja huovata — to swing from one course of action or opinion to another
  • French: hésiter — to swing from one course of action or opinion to another
  • Georgian: ყოყმანი (q̇oq̇mani) — to swing from one course of action or opinion to another
  • Georgian: მერყეობა (merq̇eoba) — to swing from one course of action or opinion to another
  • German: schwanken — to swing from one course of action or opinion to another
  • Greek: ταλαντεύομαι (talantévomai) — to swing from one course of action or opinion to another
  • Greenlandic: nakimavoq — to swing from one course of action or opinion to another
  • Icelandic: bera kápuna á báðum öxlum — to swing from one course of action or opinion to another
  • Italian: dubitare — to swing from one course of action or opinion to another
  • Korean: 흔들리다 (heundeullida) — to swing from one course of action or opinion to another
  • Latin: duabus sellis sedeo — to swing from one course of action or opinion to another
  • Latin: aestuō — to swing from one course of action or opinion to another
  • Latin: vacillō — to swing from one course of action or opinion to another
  • Māori: tātāu — to swing from one course of action or opinion to another
  • Portuguese: vacilar — to swing from one course of action or opinion to another
  • Russian: колеба́ться (kolebátʹsja) — to swing from one course of action or opinion to another
  • Spanish: vacilar — to swing from one course of action or opinion to another
  • Spanish: titubear — to swing from one course of action or opinion to another
  • Turkish: bocalamak — to swing from one course of action or opinion to another