3 entries under one-off topic. ×

4
rare(adjective, exceptional, exclusive, single, alone)
2
unexampled(adjective, extraordinary, exceptional, rare, exclusive)
0
one and only(expression, adjective, idiom, exceptional, rare)
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APASmart Define. (2015). sui generis thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/sui_generis/thesaurus/synonyms
ChicagoSmart Define. 2015. "sui generis thesaurus" https://smartdefine.org/sui_generis/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, sui generis thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/sui_generis/thesaurus/synonyms>.
MLASmart Define. "sui generis thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/sui_generis/thesaurus/synonyms>