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Perfidy
01
the act of intentionally betraying someone or something's trust in one
02
the state of lacking faithfulness and loyalty
Example
The historic treaty violation marked an egregious perfidy between the two nations.
The generals considered the unauthorized negotiations with the enemy a clear act of perfidy.
The friendship suffered a severe blow due to perfidy, as confidential secrets were revealed.
The business partnership ended in perfidy when one partner secretly established a competing venture.
The spy's perfidy jeopardized the mission, as classified information fell into the wrong hands.
