| unimaginable(adjective, exceptional, irregular, anomalous) |
| unordinary(adjective, exceptional, irregular, anomalous) |
| unprecedented(adjective, exceptional, irregular, anomalous) |
| unpredictable(adjective, changeable, fickle, erratic) |
| unrelated(adjective, irrelevant, foreign, inapposite) |
| unreliable(adjective, changeable, fickle, erratic) |
| unsettled(adjective, changeable, fickle, erratic) |
| unstable(adjective, changeable, fickle, erratic) |
| unsteady(adjective, changeable, fickle, erratic) |
| unthinkable(adjective, exceptional, irregular, anomalous) |
| unusual(adjective, exceptional, irregular, anomalous) |
| vacillating(adjective, changeable, fickle, erratic) |
| vagrant(adjective, changeable, fickle, erratic) |
| variant(adjective, changeable, fickle, erratic) |
| varying(adjective, changeable, fickle, erratic) |
| volatile(adjective, changeable, fickle, erratic) |
| wavering(adjective, changeable, fickle, erratic) |
| whimsical(adjective, changeable, fickle, erratic) |