| unknown(adjective, obscure, mysterious) | |
| unidentified(adjective, secret) | |
| foreign(adjective, regular, irrelevant) | |
| obscure(adjective, unknown) | |
| uncharted | |
| undiscovered(adjective, familiar) | |
| secret(noun, adjective, clandestine, underhand, unrevealed) | |
| chartless | |
| anonymous(adjective, choice, unknown) | |
| faceless | |
| mysterious(adjective, secret, concealed) | |
| nameless(adjective, unknown, anonymous) | |
| unfamiliar(adjective, strange, common, different, unknown) | |
| unspecified(adjective, specified) | |
| incognito(adjective, disguise) | |
| inside(adjective, secret, outside) | |
| little-known | |
| mystery(noun, understanding, secret, puzzle, abstruseness) | |
| occult(adjective, clear, secret, supernatural) | |
| private |
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| APA | Smart Define. (2015). known thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/known/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "known thesaurus" https://smartdefine.org/known/thesaurus/antonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, known thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/known/thesaurus/antonyms>. |
| MLA | Smart Define. "known thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/known/thesaurus/antonyms> |