Definition of treachery in English:



  • 1[mass noun] Betrayal of trust.

    ‘many died because of his treachery’
    [count noun] ‘his distaste for plots and treacheries’
    • ‘It is a story of intrigue, deception and treachery.’
    • ‘Pirates like Blackbeard have been feared and fabled for centuries in stories of treachery at sea and buried treasure.’
    • ‘But we should not allow him, or his friends, to forget his own personal treachery.’
    • ‘I am stunned at their casual treachery to this country, to humanity.’
    • ‘This would be seen as treachery despite the fact that it could be a key step in the revitalisation of the economy on both sides.’
    • ‘Already on this very day this step of his is put down as one of the greatest acts of treachery in Hungary's history.’
    • ‘From the perspective of Russian strategists, this proposal smacks of incredible stupidity or even treachery.’
    • ‘Lady Macbeth feels that if her husband does not enjoy his royalty, then all of their deceit and treachery has been for nothing.’
    • ‘Here was one of my intellectual heroes committing an act of ideological treachery.’
    • ‘In Islamic folklore, however, they symbolize deceit, treachery, and adultery.’
    • ‘Any threat to this peace must be treated as an act of treachery - a traitor's action.’
    • ‘He accomplished this task by treachery, secrecy, speed and dishonesty.’
    • ‘The centuries that followed were full of intrigue and treachery.’
    • ‘It would, therefore, have been an act of treachery not to speak on behalf on the people that he represented.’
    • ‘This was considered an act of treachery at a time when Britain was experiencing difficulties in North Afrika against Rommel's Afrika Korps.’
    • ‘Many of the local double as actors, and twice a week they play out their heritage, s story of love and treachery.’
    • ‘In the end, an amazing tale of deceit and treachery is played out between these two men.’
    • ‘These are deliberate acts of treachery and are roundly condemned.’
    • ‘We will not forget that treachery, and we will accept nothing less than victory over the enemy.’
    • ‘The film revolves around crimes of passion based on unrequited love, lust, treachery and revenge.’
    betrayal, disloyalty, perfidy, perfidiousness, faithlessness, unfaithfulness, infidelity, bad faith, breach of trust, duplicity, deceit, deceitfulness, deception, false-heartedness, falseness, stab in the back, back-stabbing, double-dealing, untrustworthiness
    punic faith
    View synonyms
    1. 1.1The quality of being deceptive.
      ‘the treachery of language’
      • ‘They claim they can help companies place higher in your rankings, but sometimes they resort to treachery.’
      • ‘The show reeks with tension, treachery, and posturing to gain favor.’
      • ‘It highlights all that is bad in human nature: cunning, craftiness, and treachery.’
      • ‘However, they were to face the most chaotic world of deception and treachery that awaits for them.’


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