- Definitions|2
- Thesaurus|188
- Abbreviations|0
| secretly | |
| secrets | |
| sensitive | |
| shady | |
| stealth | |
| strange(obscure, deep, unknown, clandestine, underground) | |
| subterranean | |
| thieving | |
| threshold | |
| top-secret(clandestine, underground, undisclosed) | |
| trapdoor | |
| ulterior | |
| under-the-counter | |
| under cover(expression, deep, unpublished) | |
| under the table(expression, idiom, close, sensitive, inside) | |
| under wraps(expression, sensitive, clandestine, underground, undisclosed) | |
| underhand(clandestine, underground, undisclosed) | |
| undisclosed(obscure, unknown, clandestine, underground, unrevealed) | |
| unexposed | |
| unintelligible(obscure, deep, unknown, clandestine, underground) |
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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> |