English Dictionary

Pioneers in dictionary publishing since 1819

vacillate (ˈvæsɪˌleɪt Pronunciation for vacillate


verb (intransitive)

  1. to fluctuate in one's opinions; be indecisive
  2. to sway from side to side physically; totter or waver

Derived Forms

ˌvacilˈlation noun
ˈvacilˌlator noun

Word Origin

C16: from Latin vacillāre to sway, of obscure origin


View thesaurus entry
= waver, hesitate, dither, haver, sway, falter, be doubtful, fluctuate, be uncertain, be unsure, teeter, oscillate, be undecided, chop and change, seesaw, blow hot and cold, temporize, hum and haw, be unable to decide, keep changing your mind, shillyshally, be irresolute or indecisive, swither, be unable to make up your mind, dillydally


Log in to comment on this word.