psychopath

The detective couldn't shake the chilling feeling that the suspect they were interrogating might be a psychopath, with his cold, emotionless demeanor and lack of remorse for the crimes he had committed.

侦探无法摆脱那种令人不安的感觉，怀疑他们正在审讯的嫌疑人可能是一个精神病患者，因为他冷漠无情的举止，缺乏对自己犯下罪行的悔意。