| irregular(adjective, proper, common, peculiar) |
| unusual(adjective, bad, common, irregular) |
| abnormal(adjective, common, irregular, normal) |
| uncommon(adjective, ordinary, irregular, different) |
| strange(adjective, bad, poor, boring) |
| atypical(adjective, irregular, typical, nonconforming) |
| eccentric(adjective, reasonable, unusual, irregular) |
| rare(adjective, exceptional, irregular, infrequent) |
| different(adjective, common, ordinary, irregular) |
| infrequent(adjective, irregular, frequent, regularly) |
| occasional(adjective, regular, irregular, sporadic) |
| unconventional(adjective, irregular, odd, different) |
| foreign(adjective, irregular) |
| original(adjective, irregular, standard) |
| unfamiliar(adjective, strange, common, irregular) |
| inconstant(adjective, irregular) |
| novel(adjective, original) |
| unsteady(adjective, irregular) |