- Definitions|1
- Thesaurus|860
- Abbreviations|0
68 entries under adjective topic. ×
| surreptitious(dishonest, secret, hidden, spy) | |
| clandestine(adverb, show, dishonest, secret) | |
| secret(quiet, show, dishonest, hidden) | |
| covert(show, secret, reticent, hidden) | |
| hush-hush(adverb, show, informal, dishonest) | |
| underground(secret, unknown, hidden, spy) | |
| furtive(dishonest, secret, reticent, hidden) | |
| hidden(secret, spy, clandestine, underground) | |
| hole-and-corner(secret, private, hidden, spy) | |
| hugger-mugger(quiet, intriguing) | |
| confidential(secret, hidden, spy, clandestine) | |
| private(secret, unknown, hidden, spy) | |
| stealthy(quiet, dishonest, secret, hidden) | |
| underhand(deceitful, secret, hidden, spy) | |
| concealed(obscure, dishonest, secret, hidden) | |
| under wraps(expression, idiom, show, dishonest) | |
| secluded(secret, unknown, hidden, underground) | |
| cloak-and-dagger(show, full, secret, sly) | |
| spy(secret, warning, hidden, covert) | |
| backstairs(mysterious, private, reticent, taciturn) |
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| APA | Smart Define. (2015). undercover thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/undercover/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "undercover thesaurus" https://smartdefine.org/undercover/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, undercover thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/undercover/thesaurus/synonyms>. |
| MLA | Smart Define. "undercover thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/undercover/thesaurus/synonyms> |