| hermetically-impervious(adjective, tight, proof, impervious) | |
| hermetically-sealed(adjective, tight, proof, impervious) | |
| holeproof | |
| hush-hush | |
| imperceivable(obscure, dark, secret, unknown, hidden) | |
| impervious to | |
| in the dark(expression, idiom, obscure, dark, unknown) | |
| incomprehensible | |
| indiscernible(obscure, solid, dark, unknown, dense) | |
| insular(close, quiet, private, isolated, secluded) | |
| invisible(obscure, dark, deep, mysterious, unknown) | |
| isolate(close, quiet, private, isolated, secluded) | |
| isolated(adjective, quiet, private) | |
| latched(adjective, closed) | |
| leakproof | |
| leaktight(adjective, tight, proof, impervious) | |
| lightproof | |
| lighttight | |
| liquid-tight(adjective, tight, proof, impervious) | |
| locked(adjective, closed) |
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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> |