sociopath
noun [ C ] uk/ˈsəʊ.si.ə.pæθ/ us/ˈsoʊ.si.ə.pæθ/
反社会者
a person who is completely unable or unwilling to behave in a way that is acceptable to society
I'm telling you he's a complete/total sociopath. 我告诉你，他是个彻头彻尾的反社会分子。
Compare: psychopath