treachery

Etymology

From Middle English trecherie, from Old French tricherie, trecherie, from tricher, trichier (“to cheat”), from Middle Dutch trek (“a trick”), from trekken (“to draw, play a trick on”). More at trick.

noun

  1. Deliberate, often calculated, disregard for trust or faith.
  2. The act of violating the confidence of another, usually for personal gain.
  3. Treason.
  4. (countable) An act or instance of treachery.

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