perfidyyoudaoicibaDictYouDict[perfidy 词源字典]
perfidy: see faith
[perfidy etymology, perfidy origin, 英语词源]
perfidy (n.)youdaoicibaDictYouDict
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"]