malfeasance (n.) Look up malfeasance at Dictionary.com
1690s, from French malfaisance "wrongdoing," from malfaisant, from mal- "badly" (see mal-) + faisant, present participle of faire "to do," from Latin facere "to do" (see factitious). Malfeasor "wrong-doer" is attested from early 14c. Related: Malfeasant.