| occasionally(expression, adverb, time, moment, rare) |
| once in a while(expression, adverb, time, moment, rare) |
| now and again(expression, adverb, time, moment, rare) |
| now and then(expression, idiom, adverb, time, moment) |
| sometimes(expression, adverb, time, moment, rare) |
| every once in a while(expression, adverb, time, moment, rare) |
| on occasion(expression, adverb, time, moment, rare) |
| every now and then(expression, adverb, time, moment, rare) |
| off and on(expression, adverb, time, moment, rare) |
| once again |
| once and again(expression, adverb, time, moment, rare) |
| sporadically(expression, adverb, time, rare, now) |
| in some cases |
| infrequently(expression, adverb, time, moment, rare) |
| on and off(expression, adverb, time, moment, rare) |
| periodically(expression, adverb, time, rare, now) |
| ever and again(expression, adverb, time, moment, rare) |
| intermittently(expression, adverb, time, rare, vacillating) |
| at times(expression, adverb, time, moment, rare) |
| irregularly(adverb, vacillating, rarely, infrequently, intermittently) |