Etymology
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misdo (v.)

Old English misdon, "to do evil or wrong, transgress, err" (senses now obsolete), common Germanic compound (compare Old Frisian misdua, Middle Dutch misdoen, Old High German missituon, German misstun); see mis- (1) + do (v.). Meaning "to do (work, etc.) improperly" is from 1840. Related: Misdoer; misdone; misdoing.

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misdoing (n.)

"a wrong done, a fault or crime," early 13c., verbal noun from misdo.

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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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misdoubt (v.)

1530s, "to have doubts (of the reality of), to suspect, to regard (the truth or reality of) with suspicion," from mis- (1) "badly, wrongly" + doubt (v.). Meaning "to fear or suspect (the existence of something evil) is from 1560s. Intransitive sense of "entertain doubt" is from 1630s. Related: Misdoubted; misdoubting. As a noun, "irresolution," 1590s.

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