| abstruseness(noun, inscrutableness, rebus) | |
| advantaged | |
| apprehensive | |
| arcane(adjective, secret, hidden) | |
| assumed | |
| bond | |
| brainteaser(noun, understanding, abstruseness, inscrutableness, rebus) | |
| braintwister(noun, abstruseness, inscrutableness, rebus) | |
| certain | |
| clandestine | |
| cloak and dagger(expression, idiom, open) | |
| cloistered | |
| closed book(noun, expression, abstruseness, inscrutableness, rebus) | |
| cloudy | |
| confidential information(noun, expression, abstruseness, inscrutableness, rebus) | |
| cryptic | |
| cryptogram | |
| dusky | |
| enigmatic(adjective, mysterious) | |
| esoteric(adjective, obscure, mysterious) |
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| APA | Smart Define. (2015). known thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/known/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "known thesaurus" https://smartdefine.org/known/thesaurus/antonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, known thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/known/thesaurus/antonyms>. |
| MLA | Smart Define. "known thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/known/thesaurus/antonyms> |