Longman Dictionary of Contemporary English homepage

fiendish

 adjective
     
fiend‧ish
1 cruel and unpleasant:
a particularly fiendish practical joke
2 very clever in an unpleasant way:
a fiendish plan
3 extremely difficult or complicated:
several fiendish exam questions
—fiendishly adverb
—fiendishness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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