PREPOSTEROUS Meaning of PREPOSTEROUS in English preposterous BrE AmE pri ˈpɒst ə r‿əs prə-, § priː- AmE -ˈpɑːst-▷ preposterous|ly li▷ preposterous|ness nəs nɪs Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012