adj.背信弃义的，不忠的，背叛的，不可信任的

His betrayal was so perfidious that it left us all reeling.
他的背叛如此阴险，让我们所有人都感到震惊。
The politician's perfidious actions led to his downfall.
这位政客的卑鄙行径导致了他的垮台。
The enemy's perfidious ambush resulted in heavy casualties.
敌人的阴险伏击造成了重大伤亡。
She accused him of being perfidious after he broke their promise.
她在他违背诺言后指责他背信弃义。
The company's perfidious layoff strategy left employees feeling betrayed.
公司的阴险裁员策略让员工感到被出卖了。
His perfidious behavior proved that he had never been a true friend.
他的卑鄙行为证明他从来都不是真正的朋友。
The spy's perfidious acts endangered the lives of many innocent people.
那名间谍的狡诈行为危及了许多无辜者的生命。
The perfidious competitor sabotaged our project, hoping to gain an advantage.
那个狡猾的竞争对手破坏了我们的项目，希望能获得优势。
The perfidious trader manipulated the stock market for personal profit.
那个狡诈的交易员为了个人利益操纵了股市。
The historical figure was remembered as a perfidious ruler who cared only for power.
这位历史人物被铭记为只关心权力的背信弃义的统治者。