1
uncopied
1
undescribed(adjective, unconformity)
1
unduplicated
1
unequaled
1
unheard
1
unimitated
1
unknown
1
unlike
1
unprecedentedly
1
unreproduced
1
unspeakable
1
unsurpassed
1
unsuspected(adjective, unknown)
1
unthinkable(excellent, extraordinary, unusual, exceptional, marvelous)
1
untried(unusual, strange, new, fresh, novel)
1
untypical
1
weird(extraordinary, unusual, exceptional, marvelous, special)
1
woeful
1
wonderous(adjective, exceptional)
1
wondrous
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APASmart Define. (2016). unprecedented thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unprecedented/thesaurus/synonyms
ChicagoSmart Define. 2016. "unprecedented thesaurus" https://smartdefine.org/unprecedented/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unprecedented thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unprecedented/thesaurus/synonyms>.
MLASmart Define. "unprecedented thesaurus" 15 January 2016. Web. 25 September 2026. <https://smartdefine.org/unprecedented/thesaurus/synonyms>