verb
present participle of vacillate, meaning to waver in mind or opinion; indecisive
adjective
describing someone or something that is indecisive or wavering
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The board members have been vacillating on whether to approve the new budget proposal.
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She's always vacillating between which movie to watch on movie night.
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Stop vacillating and just pick a restaurant already!
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His vacillating thoughts mirrored the turbulent ocean waves.