| completely sealed(expression, adjective, idiom, airtight) | |
| confidential(close, quiet, private, isolated, secluded) | |
| corked(adjective, closed) | |
| corrosionproof | |
| covert(close, quiet, private, unknown, hidden) | |
| cut off(expression, close, quiet, private, isolated) | |
| dense | |
| difficult(obscure, complex, deep, thoughtful, reflective) | |
| dustproof | |
| dusttight | |
| eclipsed(obscure, dark, secret, unknown, hidden) | |
| enclosed(adjective, tight, proof, impervious) | |
| fastened(adjective, closed) | |
| fire-resisting | |
| fireproof | |
| flameproof | |
| foolproof | |
| gas-tight(adjective, tight, proof, impervious) | |
| gas proof(adjective, tight, proof, impervious) | |
| hermetically |
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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> |