| sub-rosa | |
| supernatural | |
| supposed | |
| swarthy | |
| teaser(noun, understanding, abstruseness, inscrutableness, rebus) | |
| tester | |
| thought | |
| thriller(noun, understanding, abstruseness, inscrutableness, rebus) | |
| tough nut to crack(noun, expression, idiom, abstruseness, inscrutableness) | |
| transmundane | |
| transoceanic | |
| unacquainted | |
| unappreciated | |
| unbaptized | |
| uncharacteristic | |
| uncommon(adjective, unknown) | |
| uncompanionable | |
| uncurious | |
| under assumed name(expression, idiom, openly) | |
| underground(adjective, secret, subversive) |
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| APA | Smart Define. (2015). known thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/known/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "known thesaurus" https://smartdefine.org/known/thesaurus/antonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, known thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/known/thesaurus/antonyms>. |
| MLA | Smart Define. "known thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/known/thesaurus/antonyms> |