misbehaving
mis-be-hav-ing
adjective
Behaving badly or improperly, often referring to children or pets.
"The misbehaving child was sent to his room."
verb
To act in an unacceptable or naughty manner, typically by children.
"The pupils were misbehaving during the lesson."
Thesaurus
Synonyms: misconduct, misdemean, misbehave