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misfeasance (n.)

"misuse of power, wrongful exercise of lawful authority or improper performance of a lawful act," 1590s, from French mesfaisance, from mesfaisant, present participle of Old French mesfaire "to misdo," from mes- "wrongly" (see mis- (2)) + faire "to do," from Latin facere "to make, do, perform" (from PIE root *dhe- "to set, put"). Related: Misfeasor.

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Definitions of misfeasance from WordNet

misfeasance (n.)
doing a proper act in a wrongful or injurious manner;
From wordnet.princeton.edu