151 entries under adjective topic. ×
| impenetrable | |
| impermeable(tight, impervious, hermetic) | |
| airtight(tight, impervious, hermetic) | |
| bombproof | |
| dampproof(tight, impervious, hermetic) | |
| hermetic(tight, impervious) | |
| insusceptible(resist, resistant) | |
| pressure-tight(tight, impervious, hermetic) | |
| protective | |
| resistive(resist, resistant) | |
| unsusceptible(resist, resistant) | |
| waterproof(tight, impervious, hermetic) | |
| watertight(tight, impervious, hermetic) | |
| callous(calm, restrained, unconcerned, subdued) | |
| diagnostic | |
| dull | |
| gritty | |
| obtuse | |
| tempered | |
| tough |
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| APA | Smart Define. (2015). proof thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/proof/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "proof thesaurus" https://smartdefine.org/proof/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, proof thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/proof/thesaurus/synonyms>. |
| MLA | Smart Define. "proof thesaurus" 22 December 2015. Web. 22 September 2026. <https://smartdefine.org/proof/thesaurus/synonyms> |