A misdeed is a type of bad behavior, especially behavior that's immoral. If you get caught stealing someone’s lunch, you’ll be punished for your misdeed.

A deed is an action, and a misdeed is a specific type of action. It’s one that's wicked, unethical, illegal, or just plain wrong. It’s the opposite of a good deed. Cheating on a test is a misdeed. So is cheating on your spouse. Stealing is a misdeed, as is any other crime. Politicians get caught in scandals when their misdeeds are discovered, such as lying or taking bribes. It’s from the Old English misdæd for "sin, evil.”

Definitions of misdeed

n improper or wicked or immoral behavior

misbehavior, misbehaviour
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delinquency, juvenile delinquency
an antisocial misdeed in violation of the law by a minor
devilment, devilry, deviltry, mischief, mischief-making, mischievousness, rascality, roguery, roguishness, shenanigan
reckless or malicious behavior that causes discomfort or annoyance in others
violent lawless behavior
familiarity, impropriety, indecorum, liberty
an act of undue intimacy
abnormality, irregularity
behavior that breaches the rule or etiquette or custom or morality
impropriety, indecency
an indecent or improper act
indiscretion, peccadillo
a petty misdeed
infantile behavior in mature persons
blaze, hell
noisy and unrestrained mischief
monkey business
mischievous or deceitful behavior
deviance, deviation
deviate behavior
an obscene act
hooliganism, malicious mischief, vandalism
willful wanton and malicious destruction of the property of others
Type of:
actus reus, misconduct, wrongdoing, wrongful conduct
activity that transgresses moral or civil law

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