66 entries under underground topic. ×
| confidential(adjective, close, show, intimate, secret) | |
| secret(adjective, close, sensitive, intimate, secret) | |
| restricted(adjective, close, show, secret, hidden) | |
| hush-hush(noun, adjective, intimate, secret, private) | |
| clandestine(adjective, secret, personal, undisclosed) | |
| arcane(adjective, obscure, intimate, secret, private) | |
| esoteric(obscure, secret, unknown, clandestine) | |
| top-secret(noun, adjective, secret, clandestine) | |
| top secret(noun, expression, adjective, idiom, sensitive) | |
| undisclosed(obscure, unknown, personal, clandestine) | |
| close(obscure, intimate, private, unknown, clandestine) | |
| covert(adjective, secret, restricted, clandestine) | |
| inside(adjective, intimate, secret, private, personal) | |
| mysterious(obscure, unknown, clandestine, undisclosed) | |
| under wraps(expression, idiom, sensitive, secret, clandestine) | |
| cryptic(obscure, unknown, clandestine, undisclosed) | |
| furtive(adjective, obscure, secret, unknown, clandestine) | |
| hidden(adjective, private, personal, clandestine) | |
| occult(obscure, unknown, clandestine, undisclosed) | |
| secretive(clandestine, undisclosed) |
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| APA | Smart Define. (2015). classified thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/classified/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "classified thesaurus" https://smartdefine.org/classified/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, classified thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/classified/thesaurus/synonyms>. |
| MLA | Smart Define. "classified thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/classified/thesaurus/synonyms> |