from
The Collaborative International Dictionary of English v.0.48
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]