| undisclosable | |
| undivulgable | |
| undivulged | |
| unexposed(obscure, dark, secret, unknown, hidden) | |
| unknown(obscure, dark, deep, mysterious, hidden) | |
| unrevealable | |
| unseen(obscure, dark, secret, unknown, hidden) | |
| unsociable(close, quiet, private, isolated, secluded) | |
| unspoken | |
| untellable | |
| untold | |
| unutterable | |
| unuttered | |
| unwhisperable | |
| veiled(obscure, deep, mysterious, secret, unknown) | |
| water-proof(adjective, tight, proof, impervious) | |
| water-repellant | |
| water-tight(adjective, tight, proof, impervious) | |
| weatherproof | |
| windproof |
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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> |