| monthly(adjective, regular, routine, sporadic, intermittent) |
| not often(expression, uncertainly, intermittently, occasionally, sporadically) |
| on-again-off-again(adjective, regular, routine, sporadic, intermittent) |
| on certain occasions(expression, adjective, idiom, regular, routine) |
| orbital(adjective, regular, routine, sporadic, intermittent) |
| periodical(adjective, regular, routine, sporadic, intermittent) |
| recurrent(adjective, regular, routine, sporadic, intermittent) |
| seasonal(adjective, regular, routine, sporadic, intermittent) |
| weekly(adjective, regular, routine, sporadic, intermittent) |
| alternately(vacillating, uncertainly, intermittently, variably, on-and-off) |
| at irregular intervals(expression, idiom, uncertainly, variably, alternately) |
| back and forth(expression, idiom, variably, alternately) |
| by bits and pieces(expression, adjective, idiom, intermittent, isochronal) |
| every other(expression, adjective, intermittent, isochronal, seasonal) |
| from pillar to post(expression, idiom, variably, alternately) |
| from side to side(expression, idiom, variably, alternately) |
| in and out(expression, idiom, variably, alternately) |
| inconsistently |
| iterant(adjective, intermittent, isochronal, seasonal) |
| like clockwork(expression, adjective, intermittent, isochronal, seasonal) |