perfidy
nounDeliberate breach of faith; calculated violation of trust; treachery.
nounThe act or an instance of treachery.
nounBreach of faith or trust; base treachery; faithlessness.
nounSynonyms See
The act of violating faith or allegiance; violation of a promise or vow, or of trust reposed; faithlessness; treachery.
nounA state or act of violating
Specifically, in warfare, an illegitimate act of deception, such as using symbols like the Red Cross or white flag to gain proximity to an enemy for purposes of attack.
nounA state or act of
an act of deliberate betrayal
nounbetrayal of a trust