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English definition of “diabolical”

diabolical

adjective uk   /ˌdaɪəˈbɒl.ɪ.kəl/ us    /-ˈbɑː.lɪ.kəl/ (US also diabolic)
informal extremely bad or shocking: Conditions in the prison were diabolical. His driving is diabolical!Serious and unpleasantNot attractive to look atInformal words for bad evil, or caused by the DevilMorally wrong and evilDishonest
diabolically
adverb uk   /-ˈbɒl.ɪ.kəl.i/ us    /-ˈbɑː.lɪ.kəl.i/
diabolically (= extremely) clever/wickedMorally wrong and evilDishonest
(Definition of diabolical from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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