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  1. not permitting penetration or passage; impenetrable: The coat is impervious to rain.
  2. incapable of being injured or impaired: impervious to wear and tear.
  3. incapable of being influenced, persuaded, or affected: impervious to reason; impervious to another's suffering.
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Also im·per·vi·a·ble [im-pur-vee-uh-buhl] /ɪmˈpɜr vi ə bəl/.

Origin of impervious

From the Latin word impervius, dating back to 1640–50. See im-2, pervious
Related formsim·per·vi·ous·ly, adverbim·per·vi·ous·ness, noun
Can be confusedimpermeable impervious

Synonyms for impervious

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for imperviousness

intransigence, friction, counteraction, obstruction, battle, check, shield, support, fight, holding, immunity, contention, combat, screen, refusal, watch, detention, protection, struggle, defiance

British Dictionary definitions for imperviousness



  1. not able to be penetrated, as by water, light, etc; impermeable
  2. (often postpositive foll by to) not able to be influenced (by) or not receptive (to)impervious to argument
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Derived Formsimperviously, adverbimperviousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for imperviousness



1640s, from Latin impervius "that cannot be passed through," from assimilated form of in- "not, opposite of" (see in- (1)) + pervius "letting things through," from per "through" + via "road." Related: Imperviously; imperviousness.

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Online Etymology Dictionary, © 2010 Douglas Harper