Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Incapable of being penetrated.
  • adjective Incapable of being affected.

from The Century Dictionary.

  • Not pervious; not to be passed through or penetrated; impermeable; impenetrable: as, a substance impervious to moisture.
  • Synonyms Impenetrable, impassable, pathless.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Not pervious; not admitting of entrance or passage through.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective unaffected or unable to be affected by
  • adjective preventative of any penetration; impenetrable, impermeable, particularly of water
  • adjective immune to damage or effect

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective not admitting of passage or capable of being affected

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From Latin impervius : in-, not; see in– + pervius, pervious; see pervious.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin impervius ("cannot be passed through"), from in- ("not") + pervius ("letting things through")

Examples

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