treachery

Treachery is a betrayal of trust.

(noun)

An example of treachery is when you cheat on your wife with her best friend.

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See treachery in Webster's New World College Dictionary

noun pl. treacheries

  1. betrayal of trust, faith, or allegiance; perfidy, disloyalty, or treason
  2. an act of perfidy or treason

Origin: ME trecherie < OFr tricherie, trickery < trichier, to cheat: see trick

See treachery in American Heritage Dictionary 4

noun pl. treach·er·ies
  1. Willful betrayal of fidelity, confidence, or trust; perfidy.
  2. The act or an instance of such betrayal.

Origin:

Origin: Middle English trecherie

Origin: , from Old French

Origin: , from trichier, to trick

Origin: , probably from Vulgar Latin *triccāre; see trick

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