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

"diabolical" in British English

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diabolicaladjective

uk   /ˌdaɪəˈbɒl.ɪ.kəl/  us   /-ˈbɑː.lɪ.kəl/ (US also diabolic)
informal extremelybad or ​shocking: Conditions in the ​prison were diabolical. His ​driving is diabolical! evil, or ​caused by the Devil
diabolically
adverb uk   /-ˈbɒl.ɪ.kəl.i/  us   /-ˈbɑː.lɪ.kəl.i/
diabolically (= ​extremely)clever/​wicked
(Definition of diabolical from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"diabolical" in American English

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diabolicaladjective

 us   /ˌdɑɪ·əˈbɑl·ɪ·kəl/
very ​evil but often ​intelligent: a diabolical genius
(Definition of diabolical from the Cambridge Academic Content Dictionary © Cambridge University Press)
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