perfidy
Pronunciation:
/ˈpɜː.fɪ.di//ˈpɝ.fɪ.di/noun
Definitions
A state or act of violating faith or allegiance; violation of a promise or vow, or of trust
Synonyms:betrayaltreacherySpecifically, 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.
A state or act of deceit.