THESAURUS
Fluctuate
alternate, back and fill, bob, bobble, careen, change, chop and change, coggle, dangle, dither, ebb and flow, equivocate, flounder, flutter, go through phases, intermit, lack regularity, librate, lurch, nutate, oscillate, pendulate, pitch, recur, reel, resonate, return, reverse, ring the changes, rock, roll, seesaw, shake, shift, shilly-shally, shuffle, stagger, swag, sway, swing, teeter, teeter-totter, tergiversate, toss, totter, turn, vacillate, vary, vibrate, wag, waggle, wave, waver, wax and wane, wobble
ROGET THESAURUS
Fluctuate
Irresolution
VB
be irresolute, hang in suspense, keep in suspense, leave "ad referendum", think twice about, pause, dawdle, remain neuter, dillydally, hesitate, boggle, hover, dacker, hum and haw, demur, not know one's own mind, debate, balance, dally with, coquet with, will and will not, chaser-balancer, go halfway, compromise, make a compromise, be thrown off one's balance, stagger like a drunken man, be afraid, let 'I dare not' wait upon 'I would', falter, waver vacillate, change, retract, fluctuate, pendulate, alternate, keep off and on, play fast and loose, blow hot and cold, shuffle, palter, blink, trim.
Changeableness
VB
fluctuate, vary, waver, flounder, flicker, flitter, flit, flutter, shift, shuffle, shake, totter, tremble, vacillate, wamble, turn and turn about, ring the changes, sway to and fro, shift to and fro, change and change about, waffle, blow with the wind (irresolute), oscillate, vibrate between, two extremes, oscillate between, two extremes, alternate, have as man phases as the moon.
Oscillation
VB
oscillate, vibrate, librate, alternate, undulate, wave, rock, swing, pulsate, beat, wag, waggle, nod, bob, courtesy, curtsy, tick, play, wamble, wabble, dangle, swag, fluctuate, dance, curvet, reel, quake, quiver, quaver, shake, flicker, wriggle, roll, toss, pitch, flounder, stagger, totter, move up and down, bob up and down, pass and repass, ebb and flow, come and go, vacillate, teeter, brandish, shake, flourish.