| firm | |
| gastight(adjective, tight, proof, impervious, hermetic) | |
| oilskin | |
| pressure-tight(adjective, tight, proof, impervious, hermetic) | |
| seaworthy | |
| slicker | |
| cape(noun, clothing) | |
| close(stop, stick, fasten) | |
| hermetically sealed | |
| oilcloth | |
| stormproof(adjective, watertight, storm-resistant) | |
| water-resistant(adjective, resistant, impervious) | |
| waterproofing | |
| windproof(adjective, watertight, stormproof, storm-resistant) | |
| air-locked(adjective, tight, proof, impervious, hermetic) | |
| air-proof(adjective, tight, proof, impervious, hermetic) | |
| air-tight(adjective, tight, proof, impervious, hermetic) | |
| airproof(adjective, tight, proof, impervious, hermetic) | |
| bold | |
| bombproof |
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| APA | Smart Define. (2015). waterproof thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/waterproof/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "waterproof thesaurus" https://smartdefine.org/waterproof/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, waterproof thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/waterproof/thesaurus/synonyms>. |
| MLA | Smart Define. "waterproof thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/waterproof/thesaurus/synonyms> |