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Webster 1913 Edition

adv.

In a prosy manner.

prosily ‎(comparative more prosily, superlative most prosily)

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.