1. [ verb ] be undecided about something; waver between conflicting positions or courses of action
Synonyms: hover vibrate oscillate

"He oscillates between accepting the new position and retirement"

Related terms: hesitate shillyshally oscillation
2. [ verb ] move or sway in a rising and falling or wavelike pattern
Synonyms: waver fluctuate

"the line on the monitor vacillated"

Related terms: swing fluctuate variation waver fluctuation
Similar spelling:   vacillator