When you do something wrong or bad, that's misbehavior. If your little brother hides your homework, intentionally dumps his cereal on the floor, and draws on the walls with permanent marker, you might say he's an expert in misbehavior.

Whether an activity is mere naughtiness or more significant misconduct, it all falls under the category of misbehavior. When a politician pays someone to stay quiet about his misbehavior, he's added additional misbehavior to the record. If you know that behavior means the way you act, it's easy to see what happens when you add the prefix mis-, meaning "bad".

Definitions of misbehavior
  1. noun
    improper or wicked or immoral behavior
    synonyms: misbehaviour, misdeed
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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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