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English definition of “fiendish”

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adjective uk   /ˈfiːn.dɪʃ/ us  
literary evil and cruel: a fiendish attack clever and difficult, sometimes in a bad way: a fiendish crossword a fiendish plot UK old-fashioned very great: a fiendish price I'm in a fiendish hurry.
noun [U] uk   /-nəs/ us  
(Definition of fiendish from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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