per·fi·dy /ˈpɝfədi/
不誠實,背信
Per·fi·dy n.; pl. Perfidies The act of violating faith or allegiance; violation of a promise or vow, or of trust reposed; faithlessness; treachery.
The ambition and perfidy of tyrants. --Macaulay.
His perfidy to this sacred engagement. --DeQuincey.
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perfidy
n 1: betrayal of a trust [syn: perfidiousness, treachery]
2: an act of deliberate betrayal [syn: treachery, betrayal,
treason]