impervious


adjective

  1. not permitting penetration or passage; impenetrable: The coat is impervious to rain.
  2. incapable of being injured or impaired: impervious to wear and tear.
  3. incapable of being influenced, persuaded, or affected: impervious to reason; impervious to another’s suffering.

adjective

  1. not able to be penetrated, as by water, light, etc; impermeable
  2. (often postpositive foll by to) not able to be influenced (by) or not receptive (to)impervious to argument
adj.

1640s, from Latin impervius “that cannot be passed through,” from assimilated form of in- “not, opposite of” (see in- (1)) + pervius “letting things through,” from per “through” + via “road.” Related: Imperviously; imperviousness.

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