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Definition of diabolical adjective from the Oxford Advanced Learner's Dictionary

diabolical

adjective
 
/ˌdaɪəˈbɒlɪkl/
 
/ˌdaɪəˈbɑːlɪkl/
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  1. (especially British English, informal) extremely bad or annoying synonym terrible
    • The traffic was diabolical.
    • It was a diabolical performance and we felt something had to be done before the next match.
  2. (also less frequent diabolic
     
    /ˌdaɪəˈbɒlɪk/
     
    /ˌdaɪəˈbɑːlɪk/
    )
    morally bad and evil; like a devilTopics Personal qualitiesc2
See diabolical in the Oxford Advanced American Dictionary
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