Etymology

impervious

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Today it means: Unaffected or unable to be affected by something. Full definition →

Latin impervius
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The story

  1. Latin · derived fromimpervius“that cannot be passed through”
  2. English todayimpervious

From Latin impervius (“that cannot be passed through”), from in- (“not”) + pervius (“letting things through”).

Etymology from Wiktionary, CC BY-SA 4.0.