70 entries under underground topic. ×
| private(adjective, separate, simple, special, individual) | |
| classified(adjective, close, show, secret, hidden) | |
| secret(adjective, close, secret, private, hidden) | |
| hush-hush(adjective, close, secret, hidden, clandestine) | |
| confidential(adjective, close, show, secret, private) | |
| arcane(adjective, secret, clandestine, undisclosed) | |
| close(adjective, light, slight, fine, poor) | |
| hidden(clandestine, undisclosed) | |
| secluded(adjective, separate, simple, special, individual) | |
| clandestine(adjective, secret, undisclosed, top-secret) | |
| covert(adjective, secret, clandestine, undisclosed) | |
| inside(adjective, secret, private, clandestine) | |
| cryptic(clandestine, undisclosed) | |
| esoteric(secret, clandestine, undisclosed, confidential) | |
| furtive(adjective, secret, clandestine, undisclosed) | |
| mysterious(clandestine, undisclosed) | |
| occult(clandestine, undisclosed) | |
| stealthy(adjective, secret, clandestine, undisclosed) | |
| strange(adjective, separate, simple, special, individual) | |
| top-secret(adjective, secret, clandestine, undisclosed) |
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| APA | Smart Define. (2016). restricted thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/restricted/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "restricted thesaurus" https://smartdefine.org/restricted/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, restricted thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/restricted/thesaurus/synonyms>. |
| MLA | Smart Define. "restricted thesaurus" 26 February 2016. Web. 22 September 2026. <https://smartdefine.org/restricted/thesaurus/synonyms> |