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[feen-dish] /ˈfin dɪʃ/
diabolically cruel and wicked.
Origin of fiendish
First recorded in 1520-30; fiend + -ish1
Related forms
fiendishly, adverb
fiendishness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for fiendish
Contemporary Examples
Historical Examples
  • No wonder he is sometimes provoked to fiendish outbursts of wrath.

  • All that fiendish cruelty and the demon of destruction could do was done.

    The Roof of France Matilda Betham-Edwards
  • What was it—madness, a nightmare, or a trap into which he had been decoyed with fiendish artfulness?

    The Secret Agent Joseph Conrad
  • This language is wanton cruelty,—it is fiendish insult,—is it not, Evelyn?

    Alice, or The Mysteries, Complete Edward Bulwer-Lytton
  • So avenged I their fiendish deeds death-fall of Danes, as was due and right.

    Beowulf Anonymous
  • Me therein, an innocent man, the fiendish foe was fain to thrust with many another.

    Beowulf Anonymous
  • Two eyes near the door were gleaming with the light of fiendish triumph.

British Dictionary definitions for fiendish


of or like a fiend
diabolically wicked or cruel
(informal) extremely difficult or unpleasant: a fiendish problem
Derived Forms
fiendishly, adverb
fiendishness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for fiendish

1520s, from fiend + -ish. Related: Fiendishly; fiendishness.

Online Etymology Dictionary, © 2010 Douglas Harper
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