n.
Pronunciation: ' p ə r-f ə -d ē
Function: noun
Inflected Form: plural -dies
Etymology: Latin perfidia, from perfidus faithless, from per- detrimental to + fides faith ― more at PER- , FAITH
Date: 1592
1 : the quality or state of being faithless or disloyal : TREACHERY
2 : an act or an instance of disloyalty