Intentionally doing something either legally or morally wrong which one had no right to do. it always involves dishonesty, illegality or knowingly exceeding authority for improper reasons. malfeasance is distinguished from “misfeasance,” which is committing a wrong or error by mistake, negligence or inadvertence, but not by intentional wrongdoing. example: a city manager putting his indigent cousin on the city payroll at a wage the manager knows is above that allowed and/or letting him file false time cards is malfeasance; putting his able cousin on the payroll which, unknown to him, is a violation of an anti-nepotism statute is misfeasance. this distinction can apply to corporate officers, public officials, trustees and others cloaked with responsibility.