perfidy

[ pur-fi-dee ]
/ ˈpɜr fɪ di /

noun, plural per·fi·dies.

deliberate breach of faith or trust; faithlessness; treachery: perfidy that goes unpunished.
an act or instance of faithlessness or treachery.

Origin of perfidy

1585–95; < Latin perfidia faithlessness, equivalent to perfid(us) faithless, literally, through (i.e., beyond the limits of) faith (per- per- + fid(ēs) faith + -us adj. suffix) + -ia -y3

Synonym study

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for perfidy

British Dictionary definitions for perfidy

perfidy

/ (ˈpɜːfɪdɪ) /

noun plural -dies

a perfidious act

Word Origin for perfidy

C16: from Latin perfidia, from perfidus faithless, from per beyond + fidēs faith
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012