psy ‧ cho ‧ path /ˈsaɪkəpæθ/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: Greek ; Origin: psych- ( ⇨ ↑ psych- ) + pathos 'suffering' ]
someone who has a serious and permanent mental illness that makes them behave in a violent or criminal way ⇨ sociopath
—psychopathic /ˌsaɪkəˈpæθɪk◂/ adjective :
a psychopathic personality
—psychopathically /-kli/ adverb