noun
a negligent, careless, or unethical behavior by a professional, especially a doctor or lawyer, resulting in harm to a patient or client
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The doctor was accused of medical malpractice after a surgical error resulted in the patient's injury.
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The lawyer warned his client about the consequences of legal malpractice.
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Some people believe that cutting corners in construction is just a form of malpractice.
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His constant lying could be considered a form of social malpractice.