Impervious
Pronunciation : Im*per"vi*ous
Part of Speech : a.
Etymology : [L. impervius; pref. im- not + per through + via way. See Voyage.]
Definition : Defn: 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 : Webster's Unabridged Dictionary, 1913