他的冷酷无情和持续欺骗行为显示出明显的心理变态倾向。

His callousness and repeated deceitful actions showed clear signs of ___psychopathy.

那个连环杀手的心理变态表现在他对受害者的毫无人性的折磨上。

The serial killer's ___psychopathy was revealed in his inhuman torture of the victims.