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Definition of “fiendish” - Learner’s Dictionary

fiendish

adjective     /ˈfiːndɪʃ/
EVIL
evil or cruel: a fiendish attackViolent or aggressiveUnkind, cruel and unfeelingTreating people or animals badly
DIFFICULT
very difficult or complicated: a fiendish crosswordDifficult things and peoplePreventing and impeding
fiendishly adverb mainly UK
extremely: fiendishly clever/difficult Very and extremeComplete and wholeIntensifying expressions
(Definition of fiendish from the Cambridge Learners Dictionary © Cambridge University Press)
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