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Definition of: impervious
(im·pûr′vē·əs) adjective
1. Permitting no passage into or through; impenetrable; impermeable.
2. Not permeable by fluids, light rays, etc.
3. Not capable of being influenced by; deaf to: a mind impervious to reason. See synonyms under IMPENETRABLE. [<L impervius <in- not + per- through + via way, road]
—im·per ′vi·ous·ly adverb
—im·per′vi·ous·ness noun
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