Perfidy

/ˈpɜːrfɪdi/noun

The state or quality of being disloyal or treacherous, often in a way that involves a breach of trust or faith.

The company's decision to secretly lay off employees during the merger was seen as an act of perfidy by the workers' union.Business
The cybersecurity firm accused the rival company of perfidy for stealing their proprietary software and passing it off as their own.Technology

Origin: From Latin 'perfidia', meaning faithlessness or disloyalty, derived from 'per' (through) and 'fides' (faith).

May 10May 11, 2026May 12

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