- Definitions|1
- Thesaurus|860
- Abbreviations|0
35 entries under adverb topic. ×
| clandestine(adjective, show, dishonest, secret) | |
| hush-hush(adjective, show, informal, dishonest) | |
| covertly(underground, secretly, furtively, slyly) | |
| secretly(clandestine, underground, slyly, underhandedly) | |
| privately(clandestine, underground, secretly, slyly) | |
| furtively(clandestine, underground, secretly, slyly) | |
| incognito(adjective, informal, secret, hidden) | |
| clandestinely(clandestine, secretly, furtively, slyly) | |
| in disguise(expression, idiom, concealment, furtively) | |
| on the QT(expression, adjective, idiom, dishonest) | |
| under cover(expression, adjective, sly, clandestine) | |
| by stealth(expression, clandestine, secretly, underhandedly) | |
| in camera(expression, clandestine, secretly, underhandedly) | |
| in holes and corners(expression, idiom, sly, clandestine) | |
| on the quiet(expression, idiom, dishonest, clandestine) | |
| on the sly(expression, idiom, secret, clandestine) | |
| stealthily(clandestine, secretly, furtively, slyly) | |
| surreptitiously(clandestine, secretly, slyly, underhandedly) | |
| closely | |
| confidentially |
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| APA | Smart Define. (2015). undercover thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/undercover/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "undercover thesaurus" https://smartdefine.org/undercover/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, undercover thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/undercover/thesaurus/synonyms>. |
| MLA | Smart Define. "undercover thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/undercover/thesaurus/synonyms> |