Impervious Im*per"vi*ous, a. [L. impervius; pref. im- not + per through + via way. See {Voyage}.] Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air. [1913 Webster]

This gulf impassable, impervious. --Milton. [1913 Webster]

The minds of these zealots were absolutely impervious. --Macaulay.

Syn: Impassable; pathless; impenetrable; imperviable; impermeable. -- {Im*per"vi*ous*ly}, adv. -- {Im*per"vi*ous*ness}, n. [1913 Webster]

The Collaborative International Dictionary of English. 2000.