Word of the Day: Perfidy

Perfidy \PUR-fuh-dee\ noun

1.  The act of violating faith or allegiance; violation of a promise or vow; faithlessness; treachery.

Origin: Perfidy comes from from Latin perfidia, from perfidus, faithless, treacherous, false, from per-, through (perhaps connoting deviation or infringement, or perhaps explicable by qui per fidem decipit, "who through faith or trust deceives") + fides, faith.