Etymology
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vacillate (v.)

1590s, "to sway unsteadily," from Latin vacillatus, past participle of vacillare "sway to and fro; hesitate" (see vacillation). Meaning "to waver between two opinions or courses" is recorded from 1620s. Related: Vacillated; vacillates; vacillating.

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Definitions of vacillate

vacillate (v.)
be undecided about something; waver between conflicting positions or courses of action;
Synonyms: hover / vibrate / oscillate
vacillate (v.)
move or sway in a rising and falling or wavelike pattern;
the line on the monitor vacillated
Synonyms: fluctuate / waver
From wordnet.princeton.edu