Definition from Wiktionary, the free dictionary
- In a prosy manner.
1903, Richard Garnett, The Twilight of the Gods, and Other Tales:
- By what magic could the young student escape the weary old professor, who was prosily proving Time merely a form of thought; a proposition of which, to judge by the little value he appeared to set on the subject of his discourse, he must himself have been fully persuaded?
1916, Peggy Edmund & Harold W. Williams, compilers, Toaster's Handbook:
- He was earnestly but prosily orating at the audience.