PERFIDY


Meaning of PERFIDY in English

/ ˈpɜːfədi; NAmE ˈpɜːrf-/ noun

[ U ] ( literary ) unfair treatment of sb who trusts you

SYN treachery

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WORD ORIGIN

late 16th cent.: via French from Latin perfidia , from perfidus treacherous, based on per- to ill effect + fides faith.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.