malfeasance (n.)

1690s, from French malfaisance "wrongdoing," from malfaisant, from mal- "badly" (see mal-) + faisant, present participle of faire "to do," from Latin facere "to do" (from PIE root *dhe- "to set, put"). Malfeasor "wrong-doer" is attested from early 14c. Related: Malfeasant.

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