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Definition of impervious:

  1. Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air.

Synonyms:

run-resistant, unmoved, resistive, soundproof, impassive, moth-resistant, hermetic, insusceptible, mothproof, tight, resist, imperviable, proof, greaseproof, callous, inaccessible, indifferent, ladder-proof, unsusceptible, runproof, resistant.

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