23 entries under covert topic. ×
| spy(secret, hidden) | |
| stealth(secret, hidden, spy) | |
| sub-rosa(secret, hidden, spy, clandestine, undisclosed) |
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| APA | Smart Define. (2015). underground thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/underground/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "underground thesaurus" https://smartdefine.org/underground/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, underground thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/underground/thesaurus/synonyms>. |
| MLA | Smart Define. "underground thesaurus" 3 November 2015. Web. 24 September 2026. <https://smartdefine.org/underground/thesaurus/synonyms> |