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Entry 1 sense Webster, 1913

Impervious

/ĭmˌ-pẽrv'-ē-əs/ · Im·per·vi·ous · IPA /ɪmˈpɝ.vi.əs/
01 a. Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air.
  1. 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.