misfeasance

noun | \ mis-ˈfēz-ᵊns \ | mis·fea·sance

1. : the performance of a lawful action in an illegal or improper manner; specifically : the performance of an official duty in an improper or unlawful manner or with an improper or corrupt motive — compare malfeasance, nonfeasance : the performance of an official duty in an improper or unlawful manner or with an improper or corrupt motive — compare malfeasance, nonfeasance