IMPROPER Meaning of IMPROPER in English improper BrE AmE ɪm ˈprɒp ə ˌɪm- AmE \ -ˈprɑːp ə r▷ improper|ly li▷ improper|ness nəs nɪs ▶ im ˌ proper ˈ fraction, ˌ im ˌ proper ˈ fraction BrE AmE Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012