Definition of vacillate
waver, hesitate, dither (mainly British), haver, sway, falter, be doubtful, fluctuate, be uncertain, be unsure, teeter, oscillate, be undecided, chop and change, seesaw, blow hot and cold (informal), temporize, hum and haw, be unable to decide, keep changing your mind, shillyshally (informal), be irresolute or indecisive, swither (Scottish), be unable to make up your mind (mainly British), dillydally
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Definition of vacillate from the Collins English Dictionary
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