| transient(impulsive, unpredictable, explosive) |
| transitional(unstable, unsettled) |
| undecided(adjective, uncertain, doubtful, vague, hesitant) |
| unforeseeable(doubtful, vague, hesitant, changeable, unsure) |
| unlike(adjective, uneven, unbalanced, lopsided, asymmetrical) |
| unmatched(adjective, odd, uneven, unbalanced, asymmetrical) |
| unpunctual(unreliable, uneven, irregularity of recurrence) |
| unrestrained(free, wild, wanton) |
| unsteadfast |
| unsure(adjective, loose, uncertain, doubtful, vague) |
| vacillant |
| vagrant(unstable, unsettled) |
| vague(adjective, doubtful, hesitant, changeable, unsure) |
| variable quantity(noun, expression, idiom) |
| variable star(noun, expression, idiom) |
| varied(adjective, complex, deep, skilled, changeable) |
| wobbly(adjective, weak, unstable, shaky, uneven) |
| AC-DC(flexible, compliant, pliable, resilient, malleable) |
| able to adapt(expression, idiom) |
| abnormal(adjective, unusual, uncertain, unstable, irregular) |