Definition of treachery in English:

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Pronunciation: /ˈtreCH(ə)rē/

noun (plural treacheries)

Betrayal of trust; deceptive action or nature: his resignation was perceived as an act of treachery the treachery of language
More example sentences
  • It is a story of intrigue, deception and treachery.
  • These are deliberate acts of treachery and are roundly condemned.
  • Any threat to this peace must be treated as an act of treachery - a traitor's action.
betrayal, disloyalty, faithlessness, unfaithfulness, infidelity, breach of trust, duplicity, dirty tricks, deceit, deception, chicanery, stab in the back, backstabbing, double-dealing, untrustworthiness;
treason, two-timing
literary perfidy


Middle English: from Old French trecherie, from trechier 'to cheat'.

  • treat from Middle English:

    Treat is first recorded with the meanings ‘negotiate’ and ‘discuss (a subject)’. It is from Old French traitier, from Latin tractare ‘handle’. The sense ‘event that gives great pleasure’ dates from the mid 17th century, developing via the senses ‘treatment of guests’ and the entertainment you put on for them. Late Middle English treatise is also from Old French traitier, while treaty (Late Middle English), and tract (Late Middle English) are related.

Words that rhyme with treachery


For editors and proofreaders

Syllabification: treach·er·y

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