UNFATHOMABLE Meaning of UNFATHOMABLE in English unfathomab|le BrE AmE ʌn ˈfæð ə m‿əb | ə l▷ unfathomab|leness ə l nəs -nɪs ▷ unfathomab|ly li Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012