Using 'chastise' implies strong disapproval and is more intense than simply criticizing. The manager chastised the team for missing the deadline.
Pro Tip 2/3
Improve Behavior
'Chastise' is often used when the goal is to correct or change someone's behavior. The coach chastised the player to improve his attitude on the field.
Pro Tip 3/3
Authority Figure
Typically, an authority figure such as a parent or a boss will 'chastise' someone under their oversight. The teacher chastised the student for talking during class.