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perfidy
per·fi·dy [ púrfidee ]


noun 
Definition:
 
deliberate treachery: treachery or deceit ( formal )

[Late 16th century. < Latin perfidia< perfidus "treacherous" < per fidem decipere "deceive through trustingness" < fides "faith, trust"]

per·fid·i·ous [ pər fíddee əss ] adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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