Usually means: Cruelly wicked or diabolical behavior.
Definitions Related words Phrases Mentions Lyrics History Colors (New!)
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.)

Google, News, Images, Wikipedia, Reddit, BlueSky
Definitions from Wiktionary (
)
American English Definition British English Definition
▸ 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...



Writing poetry or lyrics? You can find related words that match a given meter.
This feature is permanently available from the "Related words" tab and from the Thesaurus.


(Click a button above to see words related to "fiendish" that fit the given meter.)



Home   Reverse Dictionary / Thesaurus   Datamuse   Word games   Spruce   Feedback   Dark mode   Random word   Help


Color thesaurus

Use OneLook to find colors for words and words for colors

See an example

Literary notes

Use OneLook to learn how words are used by great writers

See an example

Word games

Try our innovative vocabulary games

Play Now

Read the latest OneLook newsletter issue: Threepeat Redux