- Definitions|1
- Thesaurus|320
- Abbreviations|0
| slinky | |
| sneak(clandestine, underground, undisclosed) | |
| sub rosa(expression, secret, clandestine, underground, underhanded) | |
| top secret(expression, sensitive, clandestine, underground, undisclosed) | |
| triable | |
| tricky(sneaky, covert, secretive) | |
| unacknowledged(sensitive, clandestine, underground, undisclosed, sub-rosa) | |
| unallowed | |
| unconstitutional | |
| under cover(expression, unknowing, underhanded, recreant, privy) | |
| under false pretense(expression, idiom, sensitive, clandestine, underground) | |
| under the radar | |
| under the table(expression, idiom, sensitive, hidden, recreant) | |
| under wraps(expression, secret, hidden, clandestine, sneaky) | |
| underhand(secret, private, hidden, clandestine, sneaky) | |
| underneath | |
| unlawful | |
| unobtrusive | |
| unofficial | |
| unsuspected(secret, hidden, clandestine, underground, underhanded) |
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| APA | Smart Define. (2015). under-the-table thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/under-the-table/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "under-the-table thesaurus" https://smartdefine.org/under-the-table/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, under-the-table thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/under-the-table/thesaurus/synonyms>. |
| MLA | Smart Define. "under-the-table thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/under-the-table/thesaurus/synonyms> |