| stifled | |
| sub-rosa(adjective, close, sensitive, clandestine, underground) | |
| supersecret(noun, classified, ranked) | |
| suppressed | |
| surreptitious(clandestine, underground, undisclosed) | |
| ulterior | |
| unacknowledged(adjective, close, sensitive, inside, clandestine) | |
| under-the-table(adjective, sensitive, clandestine, underground, undisclosed) | |
| under false pretense(expression, adjective, idiom, close, sensitive) | |
| under security restrictions(noun, expression, idiom, classified, ranked) | |
| underhanded(clandestine, underground, undisclosed) | |
| undisclosable | |
| unspoken | |
| untold | |
| unutterable | |
| unuttered | |
| abstruse(clandestine, underground, undisclosed) | |
| ambiguous(clandestine, underground, undisclosed) | |
| buttoned up(expression, adjective, sensitive, sub-rosa) | |
| classifieds |
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| APA | Smart Define. (2015). top secret thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/top_secret/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "top secret thesaurus" https://smartdefine.org/top_secret/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, top secret thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/top_secret/thesaurus/synonyms>. |
| MLA | Smart Define. "top secret thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/top_secret/thesaurus/synonyms> |