Psychopathy

According to Delroy L. Paulhus and Kevin M. Williams, the "dark triad" of personality traits consists of narcissism, Machiavellianism, and psychopathy.

Tinder is cultivating psychopathy in young people.

It is true that insanity may originate in the mind, as well as in the body, but diseased action must take place in the brain, otherwise we have not, as has been well observed, “a true psychopathy.”