| cyclic(adjective, irregular, erratic, infrequent, recurrent) |
| epochal(adjective, irregular, erratic, infrequent, recurrent) |
| every other(expression, adjective, irregular, erratic, infrequent) |
| here and there(expression, adjective, idiom, irregular, erratic) |
| intermittent(adjective, irregular, erratic, recurrent, sporadic) |
| isochronal(adjective, irregular, erratic, infrequent, recurrent) |
| isochronous(adjective, irregular, erratic, infrequent, recurrent) |
| iterant(adjective, irregular, erratic, infrequent, recurrent) |
| periodic(adjective, irregular, erratic, infrequent, recurrent) |
| periodical(adjective, irregular, erratic, infrequent, recurrent) |
| recurrent(adjective, irregular, erratic, infrequent, sporadic) |
| seasonal(adjective, irregular, erratic, infrequent, recurrent) |
| stop-and-go(adjective, irregular, erratic, infrequent, recurrent) |
| at various times(expression, adjective, idiom, intermittent, isochronal) |
| centennial(adjective, intermittent, isochronal, seasonal) |
| every once in a while(expression, adjective, idiom, intermittent, isochronal) |
| every so often(expression, adjective, idiom, intermittent, isochronal) |
| hourly(adjective, intermittent, isochronal, seasonal) |
| like clockwork(expression, adjective, intermittent, isochronal, seasonal) |
| monthly(adjective, intermittent, isochronal, seasonal) |