What is the meaning of Impervious?

(a.) Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). impervious. Retrieved September 22, 2026, from http://smartdefine.org/impervious/definitions/2019581
ChicagoWebster's. 2011. "impervious" http://smartdefine.org/impervious/definitions/2019581 (accessed September 22, 2026).
HarvardWebster's 2011, impervious, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/impervious/definitions/2019581>.
MLAWebster's. "impervious" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/impervious/definitions/2019581>
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