perfidious

deceitful, treacherous, faithless, tending to betray

Billy is a very perfidious boyfriend.

by cumtome December 18, 2008

perfidy

"treachery, basically"

"someday Olaf's perfidy will end."

by phantomdweeb October 11, 2018

Perfidy

The chief export of France

The perfidy of the French is well known.

by Swampthing500 July 07, 2009