verb (used without object), vac·il·lat·ed, vac·il·lat·ing.
Origin of vacillate
Synonyms for vacillate
Examples from the Web for vacillator
Historical Examples of vacillator
The youth has within him both a Hamlet and a Saint-Just, both a vacillator and a zealot.Romain Rolland
Anything to arouse this personator of our human mutability, this vacillator between doing and letting alone!
Word Origin for vacillate
1590s, "to sway unsteadily," from Latin vacillatum, from vacillare (see vacillation). Meaning "to waver between two opinions or courses" is recorded from 1620s. Related: Vacillated; vacillates; vacillating.