Definition of "archfool"

The end was that he was thought an archfool.

1876, Great Britain. Public Record Office, John Sherren Brewer, Robert Henry Brodie, James Gairdner, Letters and Papers, Foreign and Domestic, of the Reign of Henry VIII (volume 4, issue 3, part 2, page 3154)

The sixth priest calls anyone an archfool who believes that priests have a good life. Even though he became a priest unawares and now cannot escape, he warns other young men to avoid this life of misery.

1993, Peter A. Dykema, Heiko Augustinus Oberman, Anticlericalism: in late medieval and early modern Europe, page 457