vac·​il·​late | \ ˈva-sə-ˌlāt How to pronounce vacillate (audio) \
vacillated; vacillating

Definition of vacillate

intransitive verb

1 : to waver in mind, will, or feeling : hesitate in choice of opinions or courses
2a : to sway through lack of equilibrium

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Other Words from vacillate

vacillatingly \ ˈva-​sə-​ˌlā-​tiŋ-​lē How to pronounce vacillate (audio) \ adverb
vacillator \ ˈva-​sə-​ˌlā-​tər How to pronounce vacillate (audio) \ noun

Choose the Right Synonym for vacillate

hesitate, waver, vacillate, falter mean to show irresolution or uncertainty. hesitate implies a pause before deciding or acting or choosing. hesitated before answering the question waver implies hesitation after seeming to decide and so connotes weakness or a retreat. wavered in his support of the rebels vacillate implies prolonged hesitation from inability to reach a firm decision. vacillated until events were out of control falter implies a wavering or stumbling and often connotes nervousness, lack of courage, or outright fear. never once faltered during her testimony

Examples of vacillate in a Sentence

She has vacillated on this issue. vacillated for so long that someone else stepped in and made the decision
Recent Examples on the Web Some dedicate half or whole days to each of their primary processes, but the key is to not vacillate back-and-forth between them. Tim Maurer, Forbes, "Maximize Your Productivity With “The Attention Capital Principle”," 11 Apr. 2021 Many South Korean voters vacillate between the two major parties and tend to make up their minds just weeks before presidential votes. Andrew Jeong, WSJ, "South Korean Conservatives Are on the Rise a Year Before Presidential Election," 7 Apr. 2021 But when what seems like her last shot at success slips away, Radha decides to reinvent herself as rapper, proceeding to vacillate between the worlds of hip-hop and theater on a quest to find her true voice. Tyler Aquilina,, "Netflix drops painfully funny trailer for Sundance sensation The Forty-Year-Old Version," 26 Aug. 2020 Trump has been reluctant, at times, to point fingers at Beijing in the past couple of months, vacillating between being soft and hard on the Chinese government. Nihal Krishan, Washington Examiner, "'You’d save $500 billion': Trump threatens to cut off trade with China," 14 May 2020 The Trump administration has vacillated on biofuel policy decisions in the past, raising the possibility of yet another change in course. Jennifer A Dlouhy,, "Trump’s Biofuel Plan Triggers Fallout in U.S. Farm Country," 10 May 2020 Stocks have whipsawed this week as investors vacillated between the threat that the coronavirus poses to the global economy and the hopes that governments around the world will unveil a series of measures to help businesses. New York Times, "Stocks Plunge, With Dow in Bear Market: Live Updates," 11 Mar. 2020 The muddled nature of the New Hampshire field could give a boost to whomever emerges victorious in Iowa’s Feb. 3 caucuses, possibly helping to tip vacillating Granite State voters toward a newly evident front-runner. Victoria Mcgrane,, "Sanders, Biden lead tight pack of front-runners in Suffolk University/Boston Globe N.H. poll," 21 Jan. 2020 Maduro, who has dealt with bouts of serious unrest of his own this year, has vacillated between appearing to claim credit for the multiple uprisings abroad and poking fun at his enemies’ accusations. Washington Post, "Mastermind or scapegoat? Besieged South American leaders blame Venezuela’s Maduro for historic wave of unrest," 31 Oct. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'vacillate.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of vacillate

1597, in the meaning defined at sense 2a

History and Etymology for vacillate

borrowed from Latin vacillātus, past participle of vacillāre "to be unsteady, totter, be weak or inconstant, waver," of uncertain origin

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Time Traveler for vacillate

Time Traveler

The first known use of vacillate was in 1597

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Statistics for vacillate

Last Updated

14 Apr 2021

Cite this Entry

“Vacillate.” Dictionary, Merriam-Webster, Accessed 7 May. 2021.

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More Definitions for vacillate



English Language Learners Definition of vacillate

formal : to repeatedly change your opinions or desires


vac·​il·​late | \ ˈva-sə-ˌlāt How to pronounce vacillate (audio) \
vacillated; vacillating

Kids Definition of vacillate

: to hesitate between courses or opinions : be unable to choose

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Comments on vacillate

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