| firm | |
| hermetically sealed(expression, adjective, idiom) | |
| occult(adjective, obscure, dark, deep, mysterious) | |
| pressure-tight(adjective, tight, proof, impervious) | |
| proof(adjective, tight, impervious) | |
| secluded(adjective, close, quiet, obscure, dark) | |
| abstruse(obscure, dark, deep, mysterious, secret) | |
| arcane(obscure, solid, complex, deep, mysterious) | |
| gastight(adjective, tight, proof, impervious) | |
| heavy(adjective, obscure, complex, deep, thoughtful) | |
| cabalistic(obscure, solid, complex, deep, mysterious) | |
| choked(adjective, closed) | |
| cloistered(close, quiet, private, isolated, secluded) | |
| close(quiet, obscure, solid, dark, dense) | |
| compact | |
| concealed(obscure, complex, deep, mysterious, secret) | |
| cryptic(obscure, dark, complex, unknown, hidden) | |
| enigmatic | |
| fast | |
| gasproof |
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| APA | Smart Define. (2015). hermetic thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/hermetic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hermetic thesaurus" https://smartdefine.org/hermetic/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, hermetic thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/hermetic/thesaurus/synonyms>. |
| MLA | Smart Define. "hermetic thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/hermetic/thesaurus/synonyms> |