be perfidious背信弃义;无信义
perfidious a叛卖的
Perfidious Albion英格兰
perfidious loyal背信的
Perfidious Wretch背信弃义坏蛋
perfidious faithful不忠的◇忠诚的
perfidious s不忠的;背信弃义的
Perfidious unfaithful不忠的
falsehearted perfidious背信的
ADJ（形容词） If you describe someone as perfidious, you mean that they have betrayed someone or cannot be trusted. 不忠的; 不可信的 [文学性][usu ADJ n]
Their feet will trample on the dead bodies of their perfidious aggressors.
他们将从背信弃义的侵略者的尸体上踏过。