IDIOSYNCRATIC Meaning of IDIOSYNCRATIC in English idiosyncratic BrE AmE ˌɪd i‿ə ʊ sɪŋ ˈkræt ɪk -sɪnˈ•- AmE \ ə sɪn ˈkræt̬ ɪk▷ idiosyncratic|ally ə l‿i Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012