fiendish Meaning in the Cambridge English Dictionary
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Meaning of “fiendish” in the English Dictionary

"fiendish" in British English

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fiendishadjective

uk   us   /ˈfiːn.dɪʃ/
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.
fiendishness
noun [U] uk   us   /-nəs/
(Definition of fiendish from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"fiendish" in American English

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fiendishadjective

 us   /ˈfin·dɪʃ/ usually humorous
cruel or ​evil: He took fiendish ​delight in making them ​wait.
(Definition of fiendish from the Cambridge Academic Content Dictionary © Cambridge University Press)
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