Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb vacillate

2 senses of vacillate

Sense 1
hover, vibrate, vacillate, oscillate -- (be undecided about something; waver between conflicting positions or courses of action; "He oscillates between accepting the new position and retirement")
       => hesitate, waver, waffle -- (pause or hold back in uncertainty or unwillingness; "Authorities hesitate to quote exact figures")

Sense 2
fluctuate, vacillate, waver -- (move or sway in a rising and falling or wavelike pattern; "the line on the monitor vacillated")
       => swing -- (alternate dramatically between high and low values; "his mood swings"; "the market is swinging up and down")

Antonyms of adj vacillating

1 sense of vacillating

Sense 1
vacillant, vacillating, wavering -- (uncertain in purpose or action)

INDIRECT (VIA irresolute) -> resolute -- (firm in purpose or belief; characterized by firmness and determination; "stood resolute against the enemy"; "faced with a resolute opposition"; "a resolute and unshakeable faith")

Similarity of adj vacillating

1 sense of vacillating

Sense 1
vacillant, vacillating, wavering -- (uncertain in purpose or action)
       => irresolute (vs. resolute) -- (uncertain how to act or proceed; "the committee was timid and mediocre and irresolute")