To chastise means to criticize or scold someone firmly for doing something wrong. When a teacher chastises a student for repeatedly interrupting class, she's expressing serious disapproval and making clear that the behavior needs to change. A coach might chastise players who aren't taking practice seriously, or parents might chastise a child who broke an important family rule.

The word suggests a correction that's meant to improve behavior, not just to make someone feel bad. When you're chastised, you're being told clearly and directly that you made a mistake. It feels more serious than a gentle reminder but less severe than a full punishment. You might be chastised with words alone: a stern talking-to that makes you understand you disappointed someone or violated expectations.

While being chastised isn't pleasant, it usually comes from someone who cares enough to want you to do better. A good leader knows when to encourage and when to chastise, understanding that sometimes people need clear, firm feedback to learn and grow.