intransitive verb vacillated -·lat′ed, vacillating -·lat′·ing

1. to sway to and fro; waver; totter; stagger
2. to fluctuate or oscillate
3. to waver in mind; show indecision

Etymology: < L vacillatus, pp. of vacillare, to sway to and fro, waver < IE *wek-, to be bent, prob. < base *wā-, to bend apart, turn > L varus, bent, diverse