The Collaborative International Dictionary
Undevil
Undevil \Un*dev"il\, v. t. [1st pref. un- + devil.] To free from possession by a devil or evil spirit; to exorcise. [Obs.]
They boy having gotten a habit of counterfeiting . . .
would not be undeviled by all their exorcisms.
--Fuller.
Wiktionary
undevil
vb. (context archaic transitive English) To free from possession by a devil or evil spirit; to exorcise.