verb (used without object), vacillated, vacillating.
to waver in mind or opinion; be indecisive or irresolute: His tendency to vacillate makes him a poor leader.
to sway unsteadily; waver; totter; stagger.
to oscillate or fluctuate.

1590–1600; < Latin vacillātus (past participle of vacillāre to sway to and fro); see -ate1

vacillator, noun

1. hesitate. See waver1. 2. reel. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vacillate (ˈvæsɪˌleɪt)
1.  to fluctuate in one's opinions; be indecisive
2.  to sway from side to side physically; totter or waver
[C16: from Latin vacillāre to sway, of obscure origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1590s, "to sway unsteadily," from L. vacillatum, from vacillare (see vacillation). Meaning "to waver between two opinions or courses" is recorded from 1620s. Related: Vacillated; vacillates; vacillating.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
His swing remained consistent even as the weather vacillated between misty rain, partial sunshine and overcast gloom.
Then they settled down and vacillated from one extreme to the other.
Historically, the number of sites represented in federal, state and local agency monitoring programs has vacillated.
Federal policy towards tribal governments has vacillated between two extremes.
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