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
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/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