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impervious

Source : Webster's Revised Unabridged Dictionary (1913)

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.

         This gulf impassable, impervious.        --Milton.

         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.

Source : WordNet®

impervious
     adj : not admitting of passage or capable of being affected; "a
           material impervious to water"; "someone impervious to
           argument" [syn: {imperviable}] [ant: {pervious}]
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