45 entries under noun topic. ×

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retentivity
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steadfastness
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stiffness(protection, security, rigidity, hardness)
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waterproofness(protection, security)
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watertightness(resistance, protection, security, invulnerability)
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APASmart Define. (2015). impermeability thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/impermeability/thesaurus/synonyms
ChicagoSmart Define. 2015. "impermeability thesaurus" https://smartdefine.org/impermeability/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, impermeability thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/impermeability/thesaurus/synonyms>.
MLASmart Define. "impermeability thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/impermeability/thesaurus/synonyms>