| sneaky(clandestine, underground, undisclosed) | |
| stabilized(verb, ordered) | |
| stealth | |
| stifled | |
| structured(verb, ordered) | |
| sub-rosa(sensitive, secret, clandestine, underground, undisclosed) | |
| subordinated(verb, ordered) | |
| supported(verb, ordered) | |
| suppressed | |
| synchronized | |
| tabular | |
| tabulated | |
| tight-lipped | |
| ulterior | |
| unacknowledged(sensitive, clandestine, underground, undisclosed, sub-rosa) | |
| unbreatheable | |
| under-the-table(sensitive, secret, clandestine, underground, undisclosed) | |
| under false pretense(expression, idiom, sensitive, clandestine, underground) | |
| under security | |
| underground(obscure, unknown, clandestine, undisclosed, unrevealed) |
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| APA | Smart Define. (2015). classified thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/classified/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "classified thesaurus" https://smartdefine.org/classified/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, classified thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/classified/thesaurus/synonyms>. |
| MLA | Smart Define. "classified thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/classified/thesaurus/synonyms> |