59 entries under underground topic. ×
| sly(clandestine, undisclosed) | |
| sneak(clandestine, undisclosed) | |
| sneaky(clandestine, undisclosed) | |
| stealthy(clandestine, undisclosed) | |
| strange(obscure, unknown, clandestine, undisclosed) | |
| sub-rosa(clandestine, undisclosed) | |
| subterrestrial(adjective, hidden) | |
| top-secret(clandestine, undisclosed) | |
| top secret(expression, clandestine, undisclosed) | |
| unacknowledged(clandestine, undisclosed) | |
| under-the-table(clandestine, undisclosed) | |
| under false pretense(expression, idiom, clandestine, undisclosed) | |
| underfoot(adjective, hidden) | |
| underhand(clandestine, undisclosed) | |
| underhanded(clandestine, undisclosed) | |
| unenlightened(obscure, unknown, clandestine, undisclosed) | |
| unfrequented(obscure, unknown, clandestine, undisclosed) | |
| unintelligible(obscure, unknown, clandestine, undisclosed) | |
| unpublished(obscure, unknown, clandestine, undisclosed) |
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| APA | Smart Define. (2015). covered thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/covered/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "covered thesaurus" https://smartdefine.org/covered/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, covered thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/covered/thesaurus/synonyms>. |
| MLA | Smart Define. "covered thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/covered/thesaurus/synonyms> |