23 entries under covert topic. ×
| secret(adjective, unknown, hidden, spy, concealed) | |
| surreptitious(adjective, secret, unknown, hidden, concealed) | |
| undercover(adjective, secret, unknown, hidden, spy) | |
| hidden(verb, adjective, secret, unknown, concealed) | |
| concealed(adjective, secret, unknown, hidden, spy) | |
| hole-and-corner(adjective, secret, hidden, spy) | |
| furtive(adjective, obscure, secret, unknown, hidden) | |
| hush-hush(adjective, secret, hidden, spy, clandestine) | |
| underhand(secret, hidden, spy, clandestine, fraudulent) | |
| under wraps(expression, adjective, idiom, secret, hidden) | |
| stealthy(adjective, secret, hidden, spy, clandestine) | |
| obscured(adjective, secret, hidden, clandestine, concealed) | |
| under cover(expression, secret, spy) | |
| underneath(secret, hidden, spy) | |
| confidential(adjective, secret, hidden, spy, clandestine) | |
| disguised(secret, unknown, hidden, concealed) | |
| on the QT(expression, adjective, idiom, obscure, mysterious) | |
| creep(secret, hidden, spy) | |
| incognito(secret, hidden, spy, clandestine, undisclosed) | |
| intelligence(secret, hidden, spy) |
For more, visit
Underground on
Power Thesaurus
| APA | Smart Define. (2015). underground thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/underground/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "underground thesaurus" https://smartdefine.org/underground/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, underground thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/underground/thesaurus/synonyms>. |
| MLA | Smart Define. "underground thesaurus" 3 November 2015. Web. 22 September 2026. <https://smartdefine.org/underground/thesaurus/synonyms> |