Usually means: Not allowing passage or penetration.
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We found 35 dictionaries that define the word impervious:

General (25 matching dictionaries)
  1. impervious: Merriam-Webster.com
  2. impervious: Oxford Learner's Dictionaries
  3. impervious: American Heritage Dictionary of the English Language
  4. impervious: Collins English Dictionary
  5. impervious: Vocabulary.com
  6. Impervious, impervious: Wordnik
  7. impervious: Cambridge Advanced Learner's Dictionary
  8. impervious: Wiktionary
  9. impervious: Webster's New World College Dictionary, 4th Ed.
  10. impervious: The Wordsmyth English Dictionary-Thesaurus
  11. impervious: Infoplease Dictionary
  12. impervious: Dictionary.com
  13. impervious: Online Etymology Dictionary
  14. impervious: Cambridge Essential American English Dictionary
  15. Impervious: Wikipedia, the Free Encyclopedia
  16. Impervious: Online Plain Text English Dictionary
  17. impervious: Webster's Revised Unabridged, 1913 Edition
  18. impervious: Rhymezone
  19. Impervious: AllWords.com Multi-Lingual Dictionary
  20. impervious: Webster's 1828 Dictionary
  21. impervious: Free Dictionary
  22. impervious: Mnemonic Dictionary
  23. impervious: Dictionary/thesaurus

Business (2 matching dictionaries)
  1. Construction Term Glossary (No longer online)
  2. impervious: Legal dictionary

Computing (1 matching dictionary)
  1. impervious: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Slang (1 matching dictionary)
  1. impervious: Urban Dictionary

Tech (5 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. impervious: Canadian Soil Information System
  3. Lake and Water Word Glossary (No longer online)
  4. National Weather Service Glossary (No longer online)
  5. Glossary of Water Resource Terms (No longer online)

(Note: See imperviously as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Unaffected or unable to be affected by something.
adjective:  Preventive of any penetration; impenetrable, impermeable, particularly of water.
adjective:  Immune to damage or effect.

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    gunmetal,     charcoal,     obsidian,     onyx,     graphite, more...



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Colors:
    gunmetal,     charcoal,     obsidian,     onyx,     graphite, more...



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