- Definitions|2
- Thesaurus|188
- Abbreviations|0
| QT | |
| abstruse(obscure, unknown, clandestine, underground, undisclosed) | |
| ambiguous(obscure, deep, unknown, clandestine, underground) | |
| buttoned up(expression, sensitive, sub-rosa) | |
| byway | |
| cabinet | |
| clandestinely | |
| cloak and dagger(expression, idiom, obscure, unknown, unrevealed) | |
| closet(obscure, intimate, private, unknown, clandestine) | |
| deep(obscure, unknown, clandestine, underground, undisclosed) | |
| devious | |
| dishonest | |
| door | |
| for eyes only(expression, idiom, sensitive, sub-rosa) | |
| gate | |
| hidden(clandestine, underground, undisclosed) | |
| hidden away(expression, sensitive, sub-rosa) | |
| hole-and-corner | |
| huggermugger(adjective, secret) | |
| hushed(intimate, secret, private, confidential) |
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| APA | Smart Define. (2013). backdoor thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/backdoor/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "backdoor thesaurus" https://smartdefine.org/backdoor/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2013, backdoor thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/backdoor/thesaurus/synonyms>. |
| MLA | Smart Define. "backdoor thesaurus" 19 May 2013. Web. 23 September 2026. <https://smartdefine.org/backdoor/thesaurus/synonyms> |