| occasional(adjective, light, slight, continue, thin) |
| random(adjective, irregular, disturbed, broken, off) |
| irregular(adjective, special, irregular, variable, broken) |
| intermittent(adjective, continue, regular, irregular, routine) |
| erratic(adjective, irregular, restless, disturbed, broken) |
| fitful(adjective, continue, irregular, unreliable, variable) |
| uncommon(adjective, slight, thin, unusual, strange) |
| rare(adjective, slight, thin, unusual, exceptional) |
| scattered(adjective, single, alone, off, isolation) |
| spasmodic(adjective, regular, irregular, routine, unreliable) |
| discontinuous(adjective, irregular, unreliable, uneven, variable) |
| infrequent(adjective, slight, thin, unusual, strange) |
| periodic(adjective, continue) |
| isolated(adjective, single, alone, off, isolation) |
| broken(adjective, irregular, restless, disturbed, incoherent) |
| capricious(adjective, irregular, unreliable, variable, broken) |
| separate(adjective, single, alone, isolation, apart) |
| disconnected(adjective, single, alone, isolation, incoherent) |
| unsystematic(adjective, irregular, erratic, random, haphazard) |
| haphazard(adjective, irregular, disturbed, broken, erratic) |