Reprove is a verb used in the same way as “scold,” or “dress down.” To reprove is to express your dissatisfaction or disapproval with something. It’s a less severe word than denounce or decry. It is closer to the verb criticize. Your parents might reprove you for a minor offense like not cleaning your room or chewing with your mouth open. And, for the record, reprove is not the root word prove with the prefix re- as if to mean “prove again.” If you use it that way, someone would likely reprove you.