Perfidy is another word for disloyalty. When I was in college, I thought I was being clever with this sign:


Current Dallas Maverick Seth Curry—brother of Stephen, son of Dell—led all NCAA Division I freshmen in scoring his first year at Liberty University. It was my first year there as well, and I remember the excitement of lining up early for every home game so we could sit in the front row and scream at the opposing players and high-five our team after each win. When Curry transferred to Duke the next year, you can imagine my disappointment at his perfidy.

In another, much more famous basketball example, Lebron James took to live national TV to announce his perfidious decision to desert Cleveland and sign with Miami. He immediately became a super villain to a large percentage of NBA fans.


Nevjera is Slovenian for perfidy. Yugoslavian director Vladimir Pogačić made a movie called Nevjera in 1953. Check out the trailer:

Here are some famous quotes that use the word perfidy:

I know that when people pull apart, they usually employ misunderstanding as a weapon, deliberately getting hold of the stick’s wrong end, impaling themselves on its point in order to prove the perfidy of the other.” – Salmon Rushdie

Each government accuses the other of perfidy, intrigue and ambition, as a means of heating the imagination of their respective nations, and incensing them to hostilities. Man is not the enemy of man, but through the medium of a false system of government.” – Thomas Paine

Life is not an easy matter… You cannot live through it without falling into frustration and cynicism unless you have before you a great idea which raises you above personal misery, above weakness, above all kinds of perfidy and baseness.” – Leon Trotsky

The Google ngram shows that usage of perfidy has been steadily declining for a couple centuries, although it’s on a slight uptick of late:


As always, let’s end with a song, “Perfidious” by Davidino: