improper conduct; wrong behavior.

unlawful conduct by an official in regard to his or her office, or by a person in the administration of justice, such as a lawyer, witness, or juror; malfeasance.

to mismanage.

to misbehave (oneself).

noun

behavior , manners , obedience

noun

delinquency , dereliction , evil , immorality , impropriety , malfeasance , malpractice , malversation , misbehavior , mischief , misdemeanor , misdoing , mismanagement , naughtiness , offense , rudeness , transgression , wrongdoing , horseplay , beastliness , bestiality , defalcation , disorder , felony , misdeed , misfeasance , mismanage , sociopathy