| mystic(obscure, solid, dark, deep, mysterious) | |
| mystical(obscure, dark, complex, deep, mysterious) | |
| noiseproof | |
| nonleaking(adjective, tight, proof, impervious) | |
| obscure(solid, dark, deep, mysterious, secret) | |
| obstructed(adjective, closed) | |
| oilproof | |
| oiltight | |
| orphic(obscure, complex, deep, thoughtful, mysterious) | |
| out of view(expression, idiom, obscure, dark, unknown) | |
| personal(close, quiet, private, isolated, secluded) | |
| plugged(adjective, closed) | |
| pressureproof(adjective, tight, proof, impervious) | |
| pressurised(adjective, tight, proof, impervious) | |
| pressurized(adjective, tight, proof, impervious) | |
| private(adjective, close, quiet, secret, unknown) | |
| proof against | |
| punctureproof | |
| quarantined(close, quiet, private, isolated, secluded) | |
| rainproof |
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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> |