psychopathic /ˌsaɪkoʊˈpæθɪk/adjective 1noun 1forms 3 adjective1 •Exhibiting the behaviors and personality traits of a psychopath.A psychopathic killer is on the loose. noun1 •(old-fashioned) A psychopath. formspsychopathics · more psychopathic · most psychopathic