Definition of fiendish in English:

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Pronunciation: /ˈfēndiSH/


1Extremely cruel or unpleasant; devilish: shrieks of fiendish laughter
More example sentences
  • I seem to be stuck halfway between fiendish laughter and pathetic sobbing.
  • Human beings over the ages have delighted in the most horrific and fiendish methods of inflicting extreme suffering, pain and mutilation.
wicked, cruel, vicious, evil, malevolent, villainous;
dated dastardly
1.1Extremely awkward or complex: a fiendish problem
More example sentences
  • The superlatively analytical Inspector Hemingway reveals his unnerving talent for solving a fiendish problem.
  • She triumphed over a field of men and women of all ages with a winning time of 13 minutes 48 seconds for a super fiendish puzzle.
difficult, complex, challenging, complicated, intricate, involved, knotty, thorny, tricky



Pronunciation: /ˈfēndiSHlē/
Example sentences
  • At least, it would be if the fiendishly clever designers of the particular variant we had did not have access to the same anti-virus web sites we did.
  • This is a fiendishly clever plot, and Burkett is indeed the patsy.
  • Here's a fiendishly clever game that will keep you engaged until Halloween, or Christmas, depending on how unbusy you are.


Pronunciation: /ˈfēndiSHnəs/
Example sentences
  • The collected fiendishness of Frankenstein, Dracula, Freddy, Chucky, the Mummy, Norman Bates's mommy, and Rosemary's baby cannot hold a candle to the terror wrought by an insecure actor, a monomaniacal director, or a stalking camera.
  • According to one newspaper, ‘the fiendishness and brutality of his acts were such that the postal laws will not permit us to print them.’
  • He wants to show us that the entire world is made up of hidden facets of fiendishness, be it in the rather routine gore of a food factory or, with Eyes, the secret experiments of a deranged doctor.

For editors and proofreaders

Syllabification: fiend·ish

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