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English definition of “impervious”

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impervious

adjective uk   /ɪmˈpɜː.vi.əs/ us    /-ˈpɝː-/

impervious adjective (SUBSTANCE)

specialized geology, engineering not allowing liquid to go through: How does glue bond with impervious substances like glass and metal?

impervious adjective (PERSON)

If someone is impervious to something,they are not influenced or affected by something: He is impervious to criticism and rational argument.
(Definition of impervious from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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