malfeasance (n.)youdaoicibaDictYouDict[malfeasance 词源字典]
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.[malfeasance etymology, malfeasance origin, 英语词源]