The Collaborative International Dictionary
Improbate
Improbate \Im"pro*bate\, v. t. [L. improbatus, p. p. of improbare to disapprove; pref. im- not + probare to approve.] To disapprove of; to disallow. [Obs.]
Wiktionary
improbate
vb. 1 (context obsolete English) To disapprove of. 2 (context obsolete English) To disallow.