60 entries under underground topic. ×
| clandestine(adjective, special, intimate, personal) | |
| restricted(adjective, secret, private, clandestine) | |
| unrevealed(adjective, individual, essential, private, mental) | |
| deep(noun, adjective, keen, sharp, smart) | |
| backdoor(close, intimate, secret, private, clandestine) | |
| backstairs(close, restricted, clandestine, discreet) | |
| camouflaged(close, clandestine, undisclosed, furtive) | |
| close(intimate, private, clandestine, central) | |
| covert(clandestine, undisclosed) | |
| cryptic(adjective, close, clandestine, undisclosed) | |
| disguised(clandestine, undisclosed) | |
| dissembled(close, restricted, clandestine, discreet) | |
| dissimulated(close, restricted, clandestine, discreet) | |
| furtive(close, clandestine, undisclosed) | |
| in ambush(expression, close, restricted, clandestine) | |
| incognito(close, restricted, clandestine, discreet) | |
| mysterious(clandestine, undisclosed) | |
| secretive(restricted, clandestine, discreet, undisclosed) | |
| sly(sharp, smart, intelligent, clever, astute) | |
| sneak(close, restricted, clandestine, discreet) |
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| APA | Smart Define. (2015). inside thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/inside/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "inside thesaurus" https://smartdefine.org/inside/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, inside thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/inside/thesaurus/synonyms>. |
| MLA | Smart Define. "inside thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/inside/thesaurus/synonyms> |