American Heritage Dictionary
(2)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
I'm sure the French and the Germans could make that case (or would have before their perfidy was exposed).— The Jawa Report
Attorneys for the state announced shock, shock we say, that such perfidy could be attributed to them.— theadvertiser.com -
Of course I do not think you will ever see me again unless it be to upbraid me for my perfidy, and I almost hope you won't, for I should sink into the ground before your eyes.— Orley Farm
But even had he been able to recognize her, he could not have suspected that her perfidy was the occasion of his misfortune.— The King's Men A Tale of To-morrow

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word about twice a month.
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