Usually means: Extremely wickedly or cruelly clever.
Definitions Related words Mentions History
We found 17 dictionaries that define the word fiendishly:

General (15 matching dictionaries)
  1. fiendishly: Merriam-Webster
  2. fiendishly: Oxford Learner's Dictionaries
  3. fiendishly: Collins English Dictionary
  4. fiendishly: Vocabulary.com
  5. fiendishly: Wordnik
  6. fiendishly: Cambridge Advanced Learner's Dictionary
  7. fiendishly: Wiktionary
  8. fiendishly: Dictionary.com
  9. fiendishly: Cambridge Essential American English Dictionary
  10. fiendishly: Rhymezone
  11. fiendishly: FreeDictionary.org
  12. fiendishly: Mnemonic Dictionary
  13. fiendishly: TheFreeDictionary.com

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

Slang (1 matching dictionary)
  1. fiendishly: Green’s Dictionary of Slang

(Note: See fiendish as well.)

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Definitions from Wiktionary (
)
American English Definition British English Definition
▸ adverb:  In a fiendish manner; evilly, wickedly.
▸ adverb:  Extremely, very in harsh or negative contexts.

Similar:
diabolically, devilishly, fiendfully, wickedly, deviously, villainously, malevolently, sinfully, sinisterly, evil, more...

Types:
diabolically, demoniacally, devilishly, hellishly, infernally, satanically, more...

▸ Words similar to fiendishly

▸ Usage examples for fiendishly

▸ Idioms related to fiendishly

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▸ Words that often appear near fiendishly

▸ Rhymes of fiendishly

▸ Invented words related to fiendishly

Similar:
diabolically, devilishly, fiendfully, wickedly, deviously, villainously, malevolently, sinfully, sinisterly, evil, more...

Types:
diabolically, demoniacally, devilishly, hellishly, infernally, satanically, more...



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