c. 1300, repreven, repruve, reproeven, "accuse, charge as a fault," from Old French reprover "accuse, blame" (12c.), from Late Latin reprobare "disapprove, reject, condemn," from Latin re- "opposite of, reversal of previous condition" (see re-) + probare "prove to be worthy" (see probate (n.)).
From mid-14c. as "deliver a rebuke, admonish;" late 14c. as "disapprove, condemn, find fault with." Related: Reproved; reproving; reprovable.