sociopathic adjective 2noun 1forms 3 adjective2 •Having the characteristics of a sociopath.He was my brother—half-brother—but he was also the most sociopathic person I've ever been close to. He would have been a monster if he had been allowed to grow up. Maybe he was one already. — 1993 •Unconcerned about the adverse consequences of one's actions on others. noun1 •(rare) A sociopath. formssociopathics · more sociopathic · most sociopathic