Definition of perfidy noun from the Oxford Advanced Learner's Dictionary

 

perfidy

 noun
noun
BrE BrE//ˈpɜːfədi//
 
; NAmE NAmE//ˈpɜːrfədi//
 
[uncountable](literary)
 
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unfair treatment of somebody who trusts you synonym treachery In Act 2 he learns of Giovanni’s perfidy and swears revenge. Word Origin late 16th cent.: via French from Latin perfidia, from perfidus ‘treacherous’, based on per- ‘to ill effect’ + fides ‘faith’.
See the Oxford Advanced American Dictionary entry: perfidy