reproof

The word "reproof" entered English in the 14th century from the Anglo-Norman French 'reprove', a noun of action from the verb 'reprover'. This verb itself stems from the Latin 'reprobare', meaning "to disapprove, reject, or censure", which is a combination of 're-' (expressing opposition) and 'probare' (to test, to prove good). The literal sense is "to prove or test again in opposition", implying a judgment that finds fault. Over time, the meaning shifted from the act of disproving or rejecting to specifically denote the verbal expression of blame or censure, with "proof" retaining its core sense of providing evidence—in this case, evidence of fault.

Structure: re (again) + proof (test, evidence) re: Latin origin, a prefix meaning "again" or "back". proof: From Old French 'prove', 'preuve', ultimately from Latin 'probare' (to test, to prove), functioning as the core noun meaning "evidence" or "test".