- To vacillate is to waver back and forth and be unable to choose between options.
An example of vacillate is when you pick black tiles, then white tiles, then blue tiles, then black tiles and can't make up your mind.
vacillate definition by Webster's New World
- to sway to and fro; waver; totter; stagger
- to fluctuate or oscillate
- to waver in mind; show indecision
Origin: ; from Classical Latin vacillatus, past participle of vacillare, to sway to and fro, waver ; from Indo-European an unverified form wek-, to be bent, probably ; from base an unverified form wā-, to bend apart, turn from source Classical Latin varus, bent, diverse
vacillate definition by American Heritage Dictionary
intransitive verb vac·il·lat·ed, vac·il·lat·ing, vac·il·lates
- To sway from one side to the other; oscillate.
- To swing indecisively from one course of action or opinion to another. See Synonyms at hesitate.
Origin: Latin vacillāre, vacillāt-, to waver.
- vacˈil·latˌing·ly adverb
- vacˌil·laˈtion noun
- vacˈil·laˌtor noun