Vacillate1. (v. t.) To move one way and the other; to reel or stagger; to waver; as, to vacillate between two choices.
2. (v. t.) To fluctuate in mind or opinion; to be unsteady or inconstant; to waver.
Thesaurus Entries
alternate, back and fill, bob, bobble, careen, change, changeable, chop and change, coggle, dally, dallying, dangle, demurring, dickey, dillydallying, dither, double-minded, doubtful, doubting, ebb and flow, eccentric, equivocate, erratic, falter, faltering, fickle, fiddle-faddle, flounder, fluctuant, fluctuate, fluctuating, flutter, go through phases, halt, halting, hang in doubt, hem and haw, hesitant, hesitate, hesitating, inconstant, indecisive, insecure, irresolute, librate, lurch, mercurial, nutate, oscillate, oscillating, pendulate, pendulous, pitch, reel, resonate, ring the changes, rock, roll, rootless, seesaw, shake, shaky, shift, shifting, shilly-shally, shilly-shallying, shuffle, stagger, stop to consider, swag, sway, swing, teeter, teeter-totter, tentative, tergiversate, think twice, timid, toss, totter, turn, uncertain, unresolved, unsettled, unstable, unsteady, unsure, vacillating, vacillatory, vary, vibrate, volatile, wag, waggle, wave, waver, wavering, wax and wane, weak, weak-kneed, whiffle, wigwag, wobble, wobbly