noun
psychopath
A person with a personality disorder characterized by persistent antisocial behavior, impaired empathy and remorse, and bold, disinhibited, and egotistical traits. Used in both clinical and colloquial contexts.
彼はサイコパスかもしれないと診断された。
He was diagnosed as possibly being a psychopath.
あの映画の悪役は典型的なサイコパスだ。
The villain in that movie is a typical psychopath.