| brassbound | |
| caulked | |
| close-fitting | |
| closed to(expression, unaffected, unyielding, unbending, resistant) | |
| damp proof(expression, idiom) | |
| falters | |
| faultless | |
| fixed | |
| galeproof | |
| good eye | |
| ideal | |
| ideally | |
| immune(unaffected, unyielding, unbending, resistant, unreceptive) | |
| impassive(unaffected, unyielding, unbending, resistant, unreceptive) | |
| imperviable(unaffected, unyielding, unbending, resistant, unreceptive) | |
| inaccessible(unaffected, unyielding, unbending, resistant, unreceptive) | |
| incapable of leaking(expression, idiom) | |
| indisputable | |
| leak-proof | |
| long-lasting |
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| APA | Smart Define. (2015). watertight thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/watertight/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "watertight thesaurus" https://smartdefine.org/watertight/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, watertight thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/watertight/thesaurus/synonyms>. |
| MLA | Smart Define. "watertight thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/watertight/thesaurus/synonyms> |