1590s, from Middle French perfidie (16c.), from Latin perfidia "faithlessness, falsehood, treachery," from perfidus "faithless," from phrase per fidem decipere "to deceive through trustingness," from per "through" (see per) + fidem (nominative fides) "faith" (see faith).
[C]ombinations of wickedness would overwhelm the world by the advantage which licentious principles afford, did not those who have long practiced perfidy grow faithless to each other. [Samuel Johnson, "Life of Waller"]
实用例句
1. As devotion unites lovers , so perfidy estranges friends.
忠诚是爱情的桥梁,欺诈是友谊的敌人.
来自《简明英汉词典》
2. The knowledge of Hurstwood's perfidy wounded her like a knife.
赫斯渥欺骗她的消息像一把刀捅到了她的心里.
来自英汉文学 - 嘉莉妹妹
3. Never mind now about Hurstwood's perfidy -- why had he done this?