To sway from one side to the other; oscillate. (verb-intransitive)
To swing indecisively from one course of action or opinion to another. See Synonyms at hesitate. (verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "vacillate" in a sentence
"The word vacillate means “to be indecisive … to sway from side to side.”"
"Versions of the words "vacillate" and "indecisive" were much more in evidence on the McCain campaign conference call this morning than in past calls."
"And let's face it - as military family members we often vacillate between reaching out and pulling back abruptly when no one grabs the hand we've extended."