| solitary(close, quiet, private, isolated, secluded) | |
| soundproof | |
| staunch | |
| stifled | |
| stopped(adjective, closed) | |
| stormproof | |
| stormtight | |
| suppressed | |
| thick | |
| tightly sealed(adjective, tight, proof, impervious) | |
| top-secret | |
| top secret | |
| totally enclosed(adjective, tight, proof, impervious) | |
| tucked away(expression, close, quiet, private, isolated) | |
| ulterior | |
| unapproachable(close, quiet, private, unaffected, unyielding) | |
| unbreatheable | |
| under security | |
| under wraps | |
| undetected(obscure, dark, secret, unknown, hidden) |
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| APA | Smart Define. (2015). hermetic thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/hermetic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hermetic thesaurus" https://smartdefine.org/hermetic/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, hermetic thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/hermetic/thesaurus/synonyms>. |
| MLA | Smart Define. "hermetic thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/hermetic/thesaurus/synonyms> |