Usually means: Extreme cruelty or wicked behavior.
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We found 10 dictionaries that define the word fiendishness:

General (9 matching dictionaries)
  1. fiendishness: Merriam-Webster
  2. fiendishness: Oxford Learner's Dictionaries
  3. fiendishness: Collins English Dictionary
  4. fiendishness: Wordnik
  5. fiendishness: Cambridge Advanced Learner's Dictionary
  6. fiendishness: Wiktionary
  7. fiendishness: Dictionary.com
  8. fiendishness: FreeDictionary.org
  9. fiendishness: TheFreeDictionary.com

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

(Note: See fiendish as well.)

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Definitions from Wiktionary (fiendishness)

▸ noun:  The quality of being fiendish.

Similar:
fiendhood, fiendliness, fiendship, devilishness, infernality, devility, frightfulness, hellishness, freakishness, ferociousness, more...

Opposite:
benevolence, kindness, goodness

▸ Words similar to fiendishness

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▸ Popular adjectives describing fiendishness

▸ Words that often appear near fiendishness

▸ Rhymes of fiendishness

▸ Invented words related to fiendishness

Similar:
fiendhood, fiendliness, fiendship, devilishness, infernality, devility, frightfulness, hellishness, freakishness, ferociousness, more...

Opposite:
benevolence, kindness, goodness



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