noun
a person suffering from a chronic mental disorder with abnormal or violent social behavior
adjective
relating to or characteristic of a psycho or psychopath
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The psychologist diagnosed the patient as a psycho with severe mental health issues.
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I heard that guy is a total psycho, always causing drama wherever he goes.
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Don't mess with that psycho, he's known for being unpredictable and dangerous.
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Her obsession with perfection has turned her into a psycho about cleanliness.