59 entries under underground topic. ×
| hidden(verb, adjective, obscure, secret, unknown) | |
| obscured(verb, adjective, secret, shady, hidden) | |
| disguised(noun, verb, adjective, secure, obscure) | |
| buried(verb, adjective, secret, unknown, hidden) | |
| camouflaged(verb, adjective, secure, obscure, mysterious) | |
| deep(obscure, unknown, clandestine, undisclosed) | |
| subterranean(adjective, hidden) | |
| under wraps(expression, secret, hidden, clandestine) | |
| arcane(obscure, unknown, clandestine, undisclosed) | |
| clandestine(secret, unknown, hidden, concealed) | |
| dissembled(verb, clandestine, undisclosed) | |
| hush-hush(secret, hidden, clandestine, undisclosed) | |
| on the QT(expression, idiom, obscure, unknown, hidden) | |
| out-of-the-way(obscure, unknown, clandestine, undisclosed) | |
| private(obscure, secret, unknown, hidden) | |
| reticent(obscure, unknown, clandestine, undisclosed) | |
| retired(obscure, unknown, clandestine, undisclosed) | |
| secretive(clandestine, undisclosed) | |
| sunken(adjective, hidden) | |
| surreptitious(secret, unknown, hidden, concealed) |
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| APA | Smart Define. (2015). covered thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/covered/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "covered thesaurus" https://smartdefine.org/covered/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, covered thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/covered/thesaurus/synonyms>. |
| MLA | Smart Define. "covered thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/covered/thesaurus/synonyms> |