| remarkable(adjective, exceptional, irregular, anomalous) |
| repugnant(adjective, irrelevant, foreign, inapposite) |
| restless(adjective, changeable, fickle, erratic) |
| reversible(adjective, changeable, fickle, erratic) |
| revocable(adjective, changeable, fickle, erratic) |
| scarce(adjective, exceptional, irregular, anomalous) |
| shifting(adjective, changeable, fickle, erratic) |
| singular(adjective, exceptional, irregular, anomalous) |
| skittish(adjective, changeable, fickle, erratic) |
| spasmodic(adjective, changeable, fickle, erratic) |
| special(adjective, exceptional, irregular, anomalous) |
| strange(adjective, exceptional, irregular, anomalous) |
| transformable(adjective, changeable, fickle, erratic) |
| transitional(adjective, changeable, fickle, erratic) |
| unassimilable(adjective, irrelevant, foreign, inapposite) |
| uncertain(adjective, changeable, fickle, erratic) |
| uncharacteristic(adjective, irrelevant, foreign, inapposite) |
| uncommon(adjective, exceptional, irregular, anomalous) |
| uncustomary(adjective, exceptional, irregular, anomalous) |
| unheard-of(adjective, exceptional, irregular, anomalous) |