professly
Professedly (in a professed manner).
rare
But Padre Fulgentio profeſsly aſcribes the invention to that prodigy of Wiſdom, Learning, and Virtue, Padre Paolo the Venetian: […]
Where it comes from
Apparently shortened from professedly. Compare Middle English profes (“professed”). Apparently unattested between the 17th and 20th centuries, hence a repeated coinage.
Adapted from the Wiktionary entry professly (CC BY-SA 4.0).