| privy(adjective, open, secret) | |
| suspect(adjective, doubtful, trustworthy) | |
| trial(adjective, definite, experimental) | |
| ulterior(adjective, secret, public, pertaining) | |
| unbeknown | |
| unbeknownst | |
| unclear(adjective, unknown) | |
| undercover(adjective, open, secret, spy) | |
| undiagnosed | |
| undisclosed | |
| unexplored | |
| unheard-of | |
| unmapped | |
| unnamed | |
| ambiguous(adjective, clear, plain, unknown) | |
| concealed(adjective, unknown) | |
| confidential(adjective, secret, untrustworthy) | |
| false(adjective, open, sound, right, wrong) | |
| hidden(adjective, clear, open, plain, unknown) | |
| hush-hush(adjective, secret, public) |
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| APA | Smart Define. (2015). known thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/known/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "known thesaurus" https://smartdefine.org/known/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, known thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/known/thesaurus/antonyms>. |
| MLA | Smart Define. "known thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/known/thesaurus/antonyms> |