UNTHINKABLE Meaning of UNTHINKABLE in English unthinkab|le BrE AmE ʌn ˈθɪŋk əb | ə l▷ unthinkab|leness ə l nəs -nɪs ▷ unthinkab|ly li Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012