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impervious

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adjective im·per·vi·ous \(ˌ)im-ˈpər-vē-əs\

Simple Definition of impervious

  • : not allowing something (such as water or light) to enter or pass through

  • : not bothered or affected by something

Source: Merriam-Webster's Learner's Dictionary

Full Definition of impervious

  1. 1 a :  not allowing entrance or passage :  impenetrable <a coat impervious to rain> b :  not capable of being damaged or harmed <a carpet impervious to rough treatment>

  2. 2 :  not capable of being affected or disturbed <impervious to criticism>

imperviously

adverb

imperviousness

noun

Examples of impervious in a sentence

  1. … Berlin struck me, above all, as impervious to any political reactions whatever … —Stephen Spender, New York Times Magazine, 30 Oct.1977

  2. He looked at her, impervious to her tears … —Jean Stafford, Children Are Bored on Sunday, (1945) 1953

  3. … the trunk … is encased in so hard a bark, as to be almost impervious to a bullet … —Herman Melville, Omoo, 1847

  4. <the material for this coat is supposed to be impervious to rain>

  5. <the rain forest is impervious to all but the most dedicated explorers>



Did You Know?

The English language is far from impervious, and, of course, a great many Latinate terms have entered it throughout its history. Impervious is one of the many that broke through in the 17th century. It comes from the Latin impervius, which adds the prefix im- to pervius, meaning "passable" or "penetrable." Pervius-which is also the source of the relatively uncommon English word pervious, meaning "accessible" or "permeable"-comes from per-, meaning "through," and via, meaning "way."

Origin and Etymology of impervious

Latin impervius, from in- + pervius pervious


First Known Use: 1640


IMPERVIOUS Defined for Kids

impervious

play
adjective im·per·vi·ous \im-ˈpər-vē-əs\

Definition of impervious for Students

  1. 1 :  not letting something enter or pass through <The coat is impervious to rain.>

  2. 2 :  not bothered or affected by something <He's impervious to their criticism.>




Medical Dictionary

impervious

play
adjective im·per·vi·ous \(ˈ)im-ˈpər-vē-əs\

Medical Definition of impervious

  1. :  not allowing entrance or passage <medication packaged in a container impervious to air and light>

imperviousness

noun




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