7 entries under impervious topic. ×

4
waterproof(adjective, resistant)
3
impermeable(adjective, resistant, impenetrable)
3
watertight(adjective, resistant)
1
rainproof(resistant, waterproof)
0
airtight(adjective, resistant)
0
sealed(adjective, resistant)
0
solid(resistant, waterproof)
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APASmart Define. (2015). water-resistant thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/water-resistant/thesaurus/synonyms
ChicagoSmart Define. 2015. "water-resistant thesaurus" https://smartdefine.org/water-resistant/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, water-resistant thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/water-resistant/thesaurus/synonyms>.
MLASmart Define. "water-resistant thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/water-resistant/thesaurus/synonyms>