Usually means: Harmful and subtly destructive influence.
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We found 36 dictionaries that define the word pernicious:

General (27 matching dictionaries)
  1. pernicious: Merriam-Webster.com
  2. pernicious: Oxford Learner's Dictionaries
  3. pernicious: American Heritage Dictionary of the English Language
  4. pernicious: Collins English Dictionary
  5. pernicious: Vocabulary.com
  6. Pernicious, pernicious: Wordnik
  7. pernicious: Cambridge Advanced Learner's Dictionary
  8. pernicious: Wiktionary
  9. pernicious: Webster's New World College Dictionary, 4th Ed.
  10. pernicious: The Wordsmyth English Dictionary-Thesaurus
  11. pernicious: Infoplease Dictionary
  12. pernicious: Dictionary.com
  13. pernicious: Online Etymology Dictionary
  14. pernicious: Cambridge Essential American English Dictionary
  15. Pernicious: Wikipedia, the Free Encyclopedia
  16. Pernicious: Online Plain Text English Dictionary
  17. pernicious: Webster's Revised Unabridged, 1913 Edition
  18. pernicious: Rhymezone
  19. Pernicious: AllWords.com Multi-Lingual Dictionary
  20. pernicious: Webster's 1828 Dictionary
  21. pernicious: Stammtisch Beau Fleuve Acronyms
  22. pernicious: Free Dictionary
  23. pernicious: The Phrontistery - A Dictionary of Obscure Words
  24. pernicious: Mnemonic Dictionary
  25. pernicious: Dictionary/thesaurus

Business (1 matching dictionary)
  1. pernicious: Legal dictionary

Computing (1 matching dictionary)
  1. pernicious: Encyclopedia

Medicine (5 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. Hepatitis C Information Central (No longer online)
  4. pernicious: Medical dictionary
  5. Hyperdictionary (No longer online)

Miscellaneous (1 matching dictionary)
  1. pernicious: A Word A Day

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

(Note: See perniciously as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Causing much harm in a subtle way.
adjective:  Causing death or injury; deadly.
adjective:  (of a person) Insidiously villainous: intending to cause harm, especially in a subtle way.
adjective:  (obsolete) swift; celeritous.

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    dark red,     blood red,     crimson,     maroon,     burgundy, more...



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