PROSAIC Meaning of PROSAIC in English a. ; ( also ~al ) 1.Prosy, unpoetical.2.Dull, flat, stupid, uninteresting, unentertaining, tiresome, tedious, prolix, prosing, vapid, tame, humdrum, matter-of-fact, commonplace. Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012