Dictionary

impervious

adjective im·per·vi·ous \(ˌ)im-ˈpər-vē-əs\

: not allowing something (such as water or light) to enter or pass through

: not bothered or affected by something

Full Definition of IMPERVIOUS

1
a :  not allowing entrance or passage :  impenetrable <a coat impervious to rain>
b :  not capable of being damaged or harmed <a carpet impervious to rough treatment>
2
:  not capable of being affected or disturbed <impervious to criticism>
im·per·vi·ous·ly adverb
im·per·vi·ous·ness noun

Examples of IMPERVIOUS

  1. <the material for this coat is supposed to be impervious to rain>
  2. <the rain forest is impervious to all but the most dedicated explorers>
  3. … Berlin struck me, above all, as impervious to any political reactions whatever … —Stephen Spender, New York Times Magazine, 30 Oct.1977

Origin of IMPERVIOUS

Latin impervius, from in- + pervius pervious
First Known Use: 1640

impervious

adjective im·per·vi·ous \(ˈ)im-ˈpər-vē-əs\   (Medical Dictionary)

Medical Definition of IMPERVIOUS

:  not allowing entrance or passage <medication packaged in a container impervious to air and light>
im·per·vi·ous·ness noun

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