| pressure-tight(adjective, tight, proof, impervious, hermetic) | |
| proof(adjective, tight, impervious, hermetic) | |
| seaworthy | |
| solid | |
| staunch | |
| flawless | |
| hermetically sealed | |
| impenetrable(adjective, fast, short, unaffected, unyielding) | |
| impregnable | |
| incontrovertible | |
| inviolable | |
| ironclad | |
| irrefutable | |
| retentive(adjective, tight, proof, impervious, hermetic) | |
| right(adjective, precise, accurate) | |
| stormproof | |
| strong | |
| windproof | |
| air-locked(adjective, tight, proof, impervious, hermetic) | |
| air-proof(adjective, tight, proof, impervious, hermetic) |
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| APA | Smart Define. (2015). watertight thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/watertight/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "watertight thesaurus" https://smartdefine.org/watertight/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, watertight thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/watertight/thesaurus/synonyms>. |
| MLA | Smart Define. "watertight thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/watertight/thesaurus/synonyms> |