| irregularly(adverb, manner, rareness, scarceness) |
| peculiarly(adverb, manner, rareness, scarceness) |
| uncommonly(adverb, manner, rareness, scarceness) |
| unusually(adverb, manner, rareness, scarceness) |
| almost never(expression, manner, rareness, scarceness) |
| barely(adverb, manner, rareness, scarceness) |
| exceptionally(adverb, manner, rareness, scarceness) |
| hardly(adverb, manner, rareness, scarceness) |
| hardly ever(expression, manner, rareness, scarceness) |
| in few instances(expression, manner, rareness, scarceness) |
| infrequently(adverb, manner, rareness, scarceness) |
| not often(expression, manner, rareness, scarceness) |
| not regularly(expression, manner, rareness, scarceness) |
| not very often(expression, manner, rareness, scarceness) |
| occasionally(adverb, manner, rareness, scarceness) |
| on occasion(expression, manner, rareness, scarceness) |
| on rare occasions(expression, manner, rareness, scarceness) |
| once in a while(expression, manner, rareness, scarceness) |
| once in blue moon(expression, manner, rareness, scarceness) |
| particularly(adverb, manner, rareness, scarceness) |