Treachery is a betrayal of trust.
An example of treachery is when you cheat on your wife with her best friend.
- betrayal of trust, faith, or allegiance; perfidy, disloyalty, or treason
- an act of perfidy or treason
Origin of treacheryMiddle English trecherie from Old French tricherie, trickery from trichier, to cheat: see trick
- Willful betrayal of fidelity, confidence, or trust; perfidy.
- The act or an instance of such betrayal.
Origin of treacheryMiddle English trecherie from Old French from trichier to trick probably from Vulgar Latin triccāre ; see trick .