vacillate

[vas-uh-leyt]
verb (used without object), vacillated, vacillating.
1.
to waver in mind or opinion; be indecisive or irresolute: His tendency to vacillate makes him a poor leader.
2.
to sway unsteadily; waver; totter; stagger.
3.
to oscillate or fluctuate.

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

vacillator, noun


1. hesitate. See waver1. 2. reel.
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World English Dictionary
vacillate (ˈvæsɪˌleɪt)
 
vb
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]
 
vacil'lation
 
n
 
'vacillator
 
n

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

vacillate
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
Those who vacillate or sulk, will miss a window of opportunity.
He may vacillate awhile longer, perhaps even ultimately settling on a third
  troop, but he has begun his transfer into adulthood.
Indeed, you yourself appear to vacillate between two positions here.
Many have left large families behind and some vacillate painfully between
  staying here permanently or returning.
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