vacillate | English to English Dictionary

be undecided about something; waver between conflicting positions or courses of action(verb.stative)

Synonym:
hover, oscillate, vibrate

source: wordnet30
move or sway in a rising and falling or wavelike pattern(verb.motion)

Example:
The line on the monitor vacillated.

Synonym:
fluctuate, waver

source: wordnet30
To move one way and the other; to reel or stagger; to waver.(verb)

source: webster1913

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