The definition of malfeasance is wrongdoing, especially by a public official.
When a politician embezzles money, this is an example of malfeasance.
Misconduct or wrongdoing, especially by a public official.
Wrongdoing or misconduct, esp. by a public official; commission of an act that is positively unlawful.
The performance of an illegal act, particularly by an elected official.
An unlawful act, particularly one committed by a public official.
Origin of malfeasance
Anglo-Norman malfaisance from Old French malfaisant malfeasant present participle of malfaire to do evil from Latin malefacere malefactor