| unreasonable(adjective, careless, unstable, unpredictable, changeable) |
| unsettled(adjective, changeable, fickle, volatile, wavering) |
| unstable(adjective, careless, lively, active, unreasonable) |
| unsteady(adjective, changeable, fickle, untrue, indecisive) |
| up-and-down(adjective, lively, unpredictable, changeable, temperamental) |
| up and down(adjective, careless, unstable, unreasonable, unpredictable) |
| vacillating(adjective, changeable, fickle, untrue, indecisive) |
| vagarious(adjective, careless, unstable, unreasonable, unpredictable) |
| variable(adjective, careless, lively, active, unstable) |
| variegate |
| vibrate(verb, change, alter, swing, rock) |
| volatile(adjective, careless, lively, active, unstable) |
| waffling(adjective, changeable, fickle, volatile, wavering) |
| wave(verb, change, alter, shake, swing) |
| waver(verb, change, alter, swing, rock) |
| wayward(adjective, careless, unstable, unreasonable, unpredictable) |
| weave(verb, shake, pause, swing, sway) |
| whiffle(verb, change, shake, swing, hesitate) |
| whimsical(adjective, careless, unstable, unreasonable, changeable) |
| yoyo(adjective, shift, fickle, untrustworthy, hedge) |