65 entries under underground topic. ×
| esoteric(obscure, unknown, clandestine, undisclosed) | |
| hush-hush(adjective, quiet, reserved, secret, private) | |
| mysterious(obscure, unknown, clandestine, undisclosed) | |
| recondite(obscure, unknown, clandestine, undisclosed) | |
| shrouded(obscure, unknown, isolated, clandestine) | |
| strange(obscure, deep, unknown, isolated, hard-hearted) | |
| undisclosed(obscure, unknown, personal, clandestine) | |
| unenlightened(obscure, deep, unknown, clandestine) | |
| unknown(obscure, clandestine, undisclosed, unrevealed) | |
| unpublished(obscure, deep, unknown, clandestine) | |
| unseen(obscure, unknown, clandestine, undisclosed) | |
| ambiguous(obscure, deep, unknown, clandestine) | |
| backstairs(clandestine, undisclosed) | |
| camouflaged(obscure, unknown, clandestine, undisclosed) | |
| classified(obscure, unknown, personal, clandestine) | |
| cloak-and-dagger(obscure, unknown, clandestine, undisclosed) | |
| clouded(obscure, unknown, clandestine, undisclosed) | |
| conspiratorial(obscure, unknown, clandestine, undisclosed) | |
| discreet(personal, clandestine, undisclosed, confidential) | |
| dissembled(clandestine, undisclosed) |
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| APA | Smart Define. (2015). retired thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/retired/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "retired thesaurus" https://smartdefine.org/retired/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, retired thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/retired/thesaurus/synonyms>. |
| MLA | Smart Define. "retired thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/retired/thesaurus/synonyms> |