prosing adjective 1noun 1forms 1 adjective1 •Writing prose; speaking or writing in a tedious or prosy manner.the prosing speeches of the honest divine — 1816 noun1 •Tedious talk or writing.He had great pretensions to wisdom […] but he was grievously given to metaphysics, and the prince found his prosings even more ponderous than those of the sage Eben Bonabben. — 1852 formsprosings