| raintight | |
| recluse | |
| remote(adjective, close, quiet, private, isolated) | |
| reserved(close, quiet, private, isolated, secluded) | |
| restricted | |
| retentive(adjective, tight, proof, impervious) | |
| rustproof | |
| screened(close, quiet, obscure, dark, private) | |
| sealable | |
| sealed-in(adjective, tight, proof, impervious) | |
| secure(adjective, closed) | |
| shadowy(obscure, dark, secret, unknown, hidden) | |
| shatterproof | |
| shellproof | |
| shut fast | |
| shut off(expression, close, quiet, private, isolated) | |
| sibylline | |
| smokeproof | |
| smoketight | |
| smothered |
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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> |