| now and then(expression, idiom, adverb, time, rare) |
| occasionally(expression, adverb, time, rare, vacillating) |
| every once in a while(expression, idiom, time, rare, vacillating) |
| every so often(expression, adverb, time, rare, vacillating) |
| once again |
| sporadically(expression, adverb, time, rare, vacillating) |
| intermittently(expression, adjective, adverb, time, rare) |
| off and on(expression, adverb, time, rare, frequency) |
| sometimes(expression, adverb, time, rare, vacillating) |
| between(adverb, preposition, middle, in, midway) |
| betweentimes(expression, time, rare, frequency) |
| on occasion(expression, time, rare, vacillating, frequency) |
| periodically(expression, adverb, time, rare, frequency) |
| time |
| amidst(in, halfway, midway, mid, between) |
| at random(expression, adverb, irregularly, sporadically) |
| at times(expression, adverb, vacillating, intermittently, occasionally) |
| betwixt(in, halfway, midway, mid, between) |
| bounded by(expression, in, halfway, mid, between) |
| centrally located(expression, in, halfway, mid, between) |