59 entries under underground topic. ×
| ambiguous(obscure, unknown, clandestine, undisclosed) | |
| backdoor(obscure, unknown, clandestine, undisclosed) | |
| backstairs(clandestine, undisclosed) | |
| below ground(adjective, hidden) | |
| classified(obscure, unknown, clandestine, undisclosed) | |
| cloak-and-dagger(obscure, unknown, clandestine, undisclosed) | |
| closet(obscure, unknown, clandestine, undisclosed) | |
| confidential(clandestine, undisclosed) | |
| conspiratorial(obscure, unknown, clandestine, undisclosed) | |
| discreet(clandestine, undisclosed) | |
| dissimulated(fake, counterfeit, lying, clandestine) | |
| enigmatical(obscure, unknown, clandestine, undisclosed) | |
| furtive(obscure, unknown, clandestine, undisclosed) | |
| hypogeal | |
| hypogean | |
| hypogeous | |
| in ambush(expression, clandestine, undisclosed) | |
| incognito(secret, hidden, clandestine, undisclosed) | |
| inside(clandestine, undisclosed) | |
| restricted(clandestine, undisclosed) |
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| APA | Smart Define. (2015). covered thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/covered/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "covered thesaurus" https://smartdefine.org/covered/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, covered thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/covered/thesaurus/synonyms>. |
| MLA | Smart Define. "covered thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/covered/thesaurus/synonyms> |