A reproof is a negative comment, reprimand, or rebuke. Even the nicest kindergarten teacher in the world will give his students a reproof if they won't stop laughing and running around the classroom. An athlete's bad behavior on or off the field might result in a reproof by his coach.

What's the difference between rebuke and reproof?

As verbs the difference between reprove and rebuke

is that reprove is to express disapproval while rebuke is to criticise harshly; to reprove.

What does the biblical word reproof mean?

: criticism for a fault : rebuke.