noun
A person who is mentally ill or deranged, especially one who behaves violently; a lunatic or a maniac.
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The police were called to apprehend the madman who was causing a disturbance in the park.
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Did you hear about the madman running around town yelling nonsense?
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That guy is a total madman, always pulling crazy stunts for attention.
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His ideas were so radical, some people thought he was a madman ahead of his time.