A child who behaves badly can be described in many ways, using several synonyms. Some words to describe a badly behaved child include unruly, disobedient, mischievous, troublesome, naughty, wild, impish, difficult, defiant, and uncontrollable. Each of these words carries a slightly different connotation and can be used to describe the child's behavior in more specific detail. For instance, an unruly child might engage in loud, disruptive behavior, while a defiant child may refuse to follow rules or listen to authority figures. Whatever word is used, it's important to remember that children who behave badly often need guidance and support rather than punishment and judgment.