| rare(adjective, exceptional, irregular, infrequent) | |
| occasional(adjective, regular, irregular, infrequent, sporadic) | |
| infrequent(adjective, irregular, regularly) | |
| sporadic(adjective, regular, irregular, infrequent) | |
| uncommon(adjective, ordinary, irregular, commonplace, infrequent) | |
| unusual(adjective, irregular, infrequent) | |
| boycott(noun, verb) | |
| irregular(adjective, infrequent) | |
| inconstant(adjective, irregular, infrequent) | |
| seldom | |
| unique | |
| extraordinary | |
| intermittent(adjective, regular, irregular, infrequent) | |
| magic | |
| unrepeated(adjective, irregular, infrequent) | |
| exceptional | |
| abnormal | |
| wild | |
| scarce(adjective, insufficient, infrequent) | |
| singular |
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| APA | Smart Define. (2015). frequent thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/frequent/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "frequent thesaurus" https://smartdefine.org/frequent/thesaurus/antonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, frequent thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/frequent/thesaurus/antonyms>. |
| MLA | Smart Define. "frequent thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/frequent/thesaurus/antonyms> |