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fiendish

[feen-dish] /ˈfin dɪʃ/
adjective
1.
diabolically cruel and wicked.
Origin
1520-1530
1520-30; fiend + -ish1
Related forms
fiendishly, adverb
fiendishness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for fiendishly

fiendish

/ˈfiːndɪʃ/
adjective
1.
of or like a fiend
2.
diabolically wicked or cruel
3.
(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 fiendishly
fiendish
1520s, from fiend + -ish.
Online Etymology Dictionary, © 2010 Douglas Harper
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