5
scattered(adjective, regularly, fewness)
5
strange(adjective, excellent, extraordinary, unusual, exceptional)
4
casual(adjective, chance, irregular, erratic, random)
4
extraordinary(adjective, excellent, unusual, strange, exceptional)
4
insufficient(adjective, weak, slight, poor, inferior)
4
meager(adjective, slight, poor, short, inadequate)
4
thin(slight, poor, spare, short, deficient)
4
unfrequent(adjective, infrequency)
4
unprecedented(adjective, excellent, unusual, special, brilliant)
3
atypical(adjective, excellent, extraordinary, strange, special)
3
isolated(adjective, regularly)
3
meagre
3
peculiar(adjective, excellent, unusual, special, brilliant)
3
remarkable(adjective, excellent, extraordinary, unusual, strange)
3
seldom met with(expression, adjective, idiom, inadequate, insufficient)
3
spasmodic(adjective, regular, irregular, routine, unreliable)
3
unfamiliar(adjective, unusual, special, rare, scarce)
3
unparalleled(adjective, unusual, special, rare, scarce)
2
abnormal(adjective, excellent, extraordinary, unusual, strange)
2
at different times
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APASmart Define. (2015). infrequent thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/infrequent/thesaurus/synonyms
ChicagoSmart Define. 2015. "infrequent thesaurus" https://smartdefine.org/infrequent/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, infrequent thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/infrequent/thesaurus/synonyms>.
MLASmart Define. "infrequent thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/infrequent/thesaurus/synonyms>