| periodic(adjective, continue, common, uncertain, regular) |
| irregular(adjective, rough, uncertain, irregular, unpredictable) |
| sporadic(adjective, continue, regular, irregular, routine) |
| fitful(adjective, continue, rough, irregular, unsettled) |
| spasmodic(adjective, regular, irregular, odd, broken) |
| recurrent(adjective, regular, irregular, routine, normal) |
| occasional(adjective, continue, regular, irregular, routine) |
| erratic(adjective, violent, irregular, unpredictable, disturbed) |
| broken(verb, adjective, rough, irregular, odd) |
| discontinuous(adjective, irregular, unreliable, uneven, variable) |
| interrupted(adjective, irregular, restless, disturbed, broken) |
| periodical(noun, adjective, continue, regular, irregular) |
| random(adjective, chance, irregular, disturbed, broken) |
| cyclic(adjective, regular, irregular, routine, erratic) |
| desultory(adjective, irregular, disturbed, unreliable, broken) |
| disconnected(adjective, irregular, unreliable, uneven, variable) |
| infrequent(adjective, regular, irregular, routine, unreliable) |
| uneven(adjective, smooth, rough, irregular, unpredictable) |
| alternate(adjective, irregular, other, sporadic, discontinuity) |
| fluctuating(adjective, rough, regular, irregular, routine) |