DEMENTED Meaning of DEMENTED in English demented BrE AmE di ˈment ɪd də-, ( ˌ ) diː-, -əd AmE \ -ˈmen t̬ əd▷ demented|ly li▷ demented|ness nəs nɪs Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012