68 entries under undisclosed topic. ×
| deep(clandestine, underground) | |
| discreet(clandestine, underground) | |
| disguised(clandestine, underground) | |
| enigmatical(clandestine, underground) | |
| incognito(clandestine, underground, discreet) | |
| mystic(clandestine, underground) | |
| mystical(clandestine, underground) | |
| out-of-the-way(clandestine, underground) | |
| recondite(clandestine, underground) | |
| reticent(clandestine, underground) | |
| retired(clandestine, underground) | |
| shrouded(clandestine, underground) | |
| sly(clandestine, underground) | |
| sneaky(clandestine, underground) | |
| surreptitious(secret, clandestine, underground, top-secret) | |
| unacknowledged(clandestine, underground) | |
| under false pretense(expression, idiom, clandestine, underground) | |
| undercover(secret, clandestine, underground, top-secret) | |
| underground | |
| underhand(clandestine, underground) |
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| APA | Smart Define. (2016). restricted thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/restricted/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "restricted thesaurus" https://smartdefine.org/restricted/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, restricted thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/restricted/thesaurus/synonyms>. |
| MLA | Smart Define. "restricted thesaurus" 26 February 2016. Web. 27 September 2026. <https://smartdefine.org/restricted/thesaurus/synonyms> |