1The company's perfidious treatment of its employees during the merger led to widespread outrage and calls for greater corporate accountability.
2Is it not perfidious to abandon one's friends and allies in their time of need, simply to advance one's own interests?
3The novel explores the theme of perfidious love, where the protagonist's partner is revealed to be leading a double life.
4The government's perfidious actions in secretly funding the opposition party have been widely condemned by the international community.
5There is a long history of perfidious behaviour in the world of politics, where the pursuit of power often seems to justify the most egregious betrayals of trust.