misbehavior
Behavior that breaks rules or is purposely disrespectful.
Misbehavior is acting in a way that breaks rules or goes against what's expected. When a student talks during quiet reading time, disrupts class with jokes, or ignores the teacher's instructions, that's misbehavior.
Misbehavior can be small, like whispering when you should be silent, or more serious, like being disrespectful to adults or intentionally breaking important rules. A child who refuses to do homework, throws food in the cafeteria, or teases classmates is engaging in misbehavior.
The word usually appears when someone in authority describes actions they need to correct. A principal might address misbehavior in an assembly, or parents might discuss their child's misbehavior at school. Notice that misbehavior is different from simple mistakes: it suggests someone knew better but chose to behave badly anyway.
Schools often have clear consequences for misbehavior: warnings, lost privileges, or meetings with parents.