Which personality disorder is characterized by suspiciousness and defensiveness?

Paranoid Personality Disorder is distinguished by a pervasive pattern of distrust and suspiciousness toward others, interpreting their motives as malicious. Individuals with this disorder often exhibit a defensive posture when interacting with others, leading them to believe that others are intending harm or deceit. This suspicion can significantly impact their relationships and functioning, as they may react to perceived threats with hostility or withdrawal.

In contrast, Schizoid Personality Disorder is characterized by a lack of interest in social relationships and a preference for solitude, without the pervasive suspicion seen in Paranoid Personality Disorder. Borderline Personality Disorder involves instability in relationships, self-image, and emotions, often marked by intense fear of abandonment rather than a chronic distrust of others. Antisocial Personality Disorder is defined by a disregard for the rights of others, often engaging in deceitful or manipulative behavior without the underlying suspicion characteristic of paranoid tendencies.

Thus, the defining trait of suspiciousness and defensiveness identifies Paranoid Personality Disorder as the accurate answer.