DIABOLIC Meaning of DIABOLIC in English diabolic BrE AmE ˌda ɪ ‿ə ˈbɒl ɪk ◂ AmE \ -ˈbɑːl-▷ diabolic|al ə l▷ diabolic|ally ə l‿i Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012