Relating to or characteristic of psychopathy or a psychopath, especially as evidenced by persistent antisocial behaviour, impaired empathy or remorse, and egotistical boldness.

Clinical studies often focus on the neural correlates of psychopathic traits.

Informal: displaying behaviour perceived as violently antisocial, dangerously reckless, or disturbingly lacking in empathy.

She described her ex-boss's psychopathic decision-making as a threat to everyone in the company.