Personality disorder in which the person is continually suspicious and mistrustful of other people:

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Paranoid personality disorder is characterized by a pervasive and unfounded distrust and suspicion of others, even when there is no evidence to support these beliefs. People with this disorder are often guarded, defensive, and hypersensitive, and may interpret benign remarks or situations as threatening or demeaning. They may also hold grudges, be quick to anger, and struggle with intimacy and close relationships.

Personality Disorder in Which the Person Is Continually Suspicious and Mistrustful