perfidy
/ˈpɜː.fɪ.di//ˈpɝ.fɪ.di/
noun
- 1
A state or act of violating faith or allegiance; violation of a promise or vow, or of trust
- 2
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.
- 3
A state or act of deceit.
Synonyms
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