2
outré(adjective, unusual, exceptional, special, original)
2
particular(adjective, extraordinary, exceptional, marvelous, special)
2
pioneering(adjective, new)
2
primary
2
puzzling(extraordinary, remarkable, particular)
2
revolutionary(adjective, new)
2
single(extraordinary, remarkable, superlative, singular, particular)
2
special(adjective, excellent, unusual, strange, new)
2
uncustomary(adjective, excellent, unusual, strange, new)
2
unexpected
2
up-to-the-minute(adjective, new)
1
almost unheard of(verb, expression, phrasal verb, infrequency)
1
astonishing
1
astounding
1
avant garde(unusual, new, fresh, fundamental, novel)
1
beguiling
1
bewildering
1
breaking new ground(expression, idiom, extraordinary, remarkable, unique)
1
causal(unusual, new, fresh, fundamental, novel)
1
conceiving(unusual, new, fresh, fundamental, novel)
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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>