2
unaccustomed(adjective, unusual, special, rare)
2
unconventional(adjective, unusual, special, rare, scarce)
2
uncustomary(adjective, excellent, unusual, special, brilliant)
2
unorthodox(adjective, unusual, special, rare)
1
aberrant(excellent, unusual, special, brilliant, unreliable)
1
almost unheard-of
1
amiss
1
any
1
at a premium(expression, adjective, idiom, inadequate, insufficient)
1
bad
1
bereft
1
blue moon
1
broken(adjective, irregular, erratic, recurrent, sporadic)
1
capricious(unreliable, uneven, variable, erratic, random)
1
certain
1
changeable(adjective, unreliable, uneven, variable, erratic)
1
cheeseparing
1
chinchy
1
chintzy
1
choice
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APASmart Define. (2015). infrequent thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/infrequent/thesaurus/synonyms
ChicagoSmart Define. 2015. "infrequent thesaurus" https://smartdefine.org/infrequent/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, infrequent thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/infrequent/thesaurus/synonyms>.
MLASmart Define. "infrequent thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/infrequent/thesaurus/synonyms>