| hardly ever(expression, adverb, barely, terrifically, seldom) |
| here and there(expression, adjective, idiom, adverb, irregular) |
| hourly(adjective, intermittent, isochronal, seasonal) |
| in and out(expression, idiom, variably, alternately) |
| inconstantly(adverb, intermittent, uncertainly, on-and-off) |
| intermittent(adjective, adverb, isochronal, seasonal, on-and-off) |
| isochronal(adjective, irregular, infrequent, sporadic, intermittent) |
| isochronous(adjective, irregular, infrequent, sporadic, intermittent) |
| iterant(adjective, irregular, infrequent, sporadic, intermittent) |
| like clockwork(expression, adjective, intermittent, isochronal, seasonal) |
| look |
| monthly(adjective, intermittent, isochronal, seasonal) |
| not often(expression, adverb, uncertainly, intermittently, occasionally) |
| noticeably(terrifically, unfrequently) |
| off and on(expression, idiom, adverb, uncertainly, intermittently) |
| on-again-off-again(adjective, intermittent, isochronal, seasonal) |
| on-and-off(adverb, intermittent, uncertainly) |
| on and off(expression, adjective, idiom, adverb, irregular) |
| on certain occasions(expression, adjective, idiom, intermittent, isochronal) |
| on occasion(expression, adverb, uncertainly, intermittently, occasionally) |