impervious Meaning, Definition & Usage

  1. adjective not admitting of passage or capable of being affected
    imperviable.
    • a material impervious to water
    • someone impervious to argument

WordNet

Im*per"vi*ous adjective
Etymology
L. impervius; pref. im- not + per through + via way. See Voyage.
Definitions
  1. 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.

Webster 1913