Unruly children are often referred to as BRATS (5 letters) and IMPS (4 letters). These terms are used to describe children who are disobedient, disrespectful, and difficult to control. They may act out in a variety of ways, such as talking back to adults, refusing to follow instructions, or engaging in destructive behavior. Unruly children can be a challenge for parents and teachers alike, as they require extra attention and patience to manage.