Usually means: Cruelly wicked or diabolical behavior.
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We found 26 dictionaries that define the word Fiendish:

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

Business (1 matching dictionary)
  1. Fiendish (Phideaux), fiendish: Legal dictionary

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

(Note: See fiendishly as well.)

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Definitions from Wiktionary (fiendish)

▸ adjective:  Sinister; evil; like a fiend.
▸ adjective:  Very difficult.

Similar:
wicked, evil, hellish, infernal, diabolical, diabolic, satanic, demonic, unholy, fiendy, more...

Opposite:
angelic, angelical

Types:
diabolical, evil, wicked, sinister, iniquitous, villainous, more...

Phrases:
The Fiendish Plot of Dr. Fu Manchu, more...

Colors:
    crimson,     blood red,     charcoal,     deep purple,     venomous violet, more...



▸ Words similar to Fiendish

▸ Usage examples for Fiendish

▸ Idioms related to Fiendish

▸ Wikipedia articles (New!)

▸ Popular nouns described by Fiendish

▸ Words that often appear near Fiendish

▸ Rhymes of Fiendish

▸ Invented words related to Fiendish

Similar:
wicked, evil, hellish, infernal, diabolical, diabolic, satanic, demonic, unholy, fiendy, more...

Opposite:
angelic, angelical

Types:
diabolical, evil, wicked, sinister, iniquitous, villainous, more...

Phrases:
The Fiendish Plot of Dr. Fu Manchu, more...

Colors:
    crimson,     blood red,     charcoal,     deep purple,     venomous violet, more...



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