47 entries under adjective topic. ×

22
rare(exceptional, irregular, infrequent)
14
occasional(regular, irregular, infrequent, sporadic)
11
infrequent(irregular, regularly)
9
sporadic(regular, irregular, infrequent)
9
uncommon(ordinary, irregular, commonplace, infrequent)
8
unusual(irregular, infrequent)
5
irregular
5
inconstant(irregular, infrequent)
4
unique
3
extraordinary
3
intermittent(regular, irregular, infrequent)
3
unrepeated(irregular, infrequent)
2
exceptional
2
abnormal
1
scarce(insufficient, infrequent)
1
anomalous
1
bizarre
1
curious
1
erratic
1
interrupted(irregular, infrequent, perennial, seasonal)
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APASmart Define. (2015). frequent thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/frequent/thesaurus/antonyms
ChicagoSmart Define. 2015. "frequent thesaurus" https://smartdefine.org/frequent/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2015, frequent thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/frequent/thesaurus/antonyms>.
MLASmart Define. "frequent thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/frequent/thesaurus/antonyms>