Synonyms|291Antonyms|5|Broader|0Narrower|0Related|48
5
novel(noun, new, unique, incomparable)
4
one-of-a-kind
4
unparalleled(noun, new, unique, incomparable)
4
unprecedented(noun, new, unique, incomparable)
2
improbable(adjective, doubtful, likely, unlikely, implausible)
2
out of the ordinary(expression, adjective, idiom, light, strange)
2
rare(adjective, light, thin, unusual, exceptional)
2
standout(adjective, rare)
2
strange(adjective, light, thin, unusual, exceptional)
2
uncommon(adjective, light, thin, extraordinary, unusual)
2
unexampled
1
attenuated
1
doubtful(unlikely, implausible)
1
dubious(doubtful, unlikely, implausible)
1
exceptional(light, thin, extraordinary, unusual, special)
1
extraordinary(light, thin, unusual, strange, exceptional)
1
far-fetched(doubtful, unlikely, implausible)
1
few(light, thin, unusual, special, rare)
1
few and far between
1
flimsy(light, thin, strange, doubtful, rare)
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ChicagoSmart Define. 2013. "unheard of thesaurus" https://smartdefine.org/unheard_of/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, unheard of thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/unheard_of/thesaurus/synonyms>.
MLASmart Define. "unheard of thesaurus" 19 May 2013. Web. 20 September 2026. <https://smartdefine.org/unheard_of/thesaurus/synonyms>