Usually means: Wicked or criminal; extremely villainous.
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We found 26 dictionaries that define the word Nefarious:

General (24 matching dictionaries)
  1. nefarious: Longman Dictionary of Contemporary English
  2. nefarious: Merriam-Webster
  3. nefarious: Oxford Learner's Dictionaries
  4. nefarious: American Heritage Dictionary of the English Language
  5. nefarious: Collins English Dictionary
  6. nefarious: Vocabulary.com
  7. Nefarious, nefarious: Wordnik
  8. nefarious: Cambridge Advanced Learner's Dictionary
  9. nefarious: Wiktionary
  10. nefarious: Webster's New World College Dictionary, 4th Ed.
  11. nefarious: The Wordsmyth English Dictionary-Thesaurus
  12. nefarious: Infoplease Dictionary
  13. Nefarious, nefarious: Dictionary.com
  14. nefarious: Online Etymology Dictionary
  15. Nefarious (EP), Nefarious (Spoon), Nefarious: Wikipedia, the Free Encyclopedia
  16. Nefarious: Online Plain Text English Dictionary
  17. nefarious: Webster's Revised Unabridged, 1913 Edition
  18. nefarious: Rhymezone
  19. nefarious: AllWords.com Multi-Lingual Dictionary
  20. nefarious: FreeDictionary.org
  21. nefarious: Mnemonic Dictionary
  22. nefarious: TheFreeDictionary.com

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

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

(Note: See nefariously as well.)

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Definitions from Wiktionary (nefarious)

▸ adjective:  Sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics.

Similar:
wicked, villainous, flagitious, fiendish, villainly, vicious, black-hearted, sinister, diabolic, sinful, more...

Opposite:
benevolent, benign

Types:
deceitful, malicious, villainous, corrupt, wicked, sinister, malevolent, treacherous, fraudulent, more...

Phrases:
Doctor Nefarious, nefarious deeds, evil nefarious bad, nefarious actor, dark nefarious, more...

Colors:
    black,     dark red,     deep purple,     midnight blue,     charcoal, more...


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Similar:
wicked, villainous, flagitious, fiendish, villainly, vicious, black-hearted, sinister, diabolic, sinful, more...

Opposite:
benevolent, benign

Types:
deceitful, malicious, villainous, corrupt, wicked, sinister, malevolent, treacherous, fraudulent, more...

Phrases:
Doctor Nefarious, nefarious deeds, evil nefarious bad, nefarious actor, dark nefarious, nefarious plans, more...

Colors:
    black,     dark red,     deep purple,     midnight blue,     charcoal, more...



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