Definition of treachery in US English:



  • Betrayal of trust; deceptive action or nature.

    ‘his resignation was perceived as an act of treachery’
    ‘the treachery of language’
    • ‘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.’
    • ‘But we should not allow him, or his friends, to forget his own personal treachery.’
    • ‘In the end, an amazing tale of deceit and treachery is played out between these two men.’
    • ‘Lady Macbeth feels that if her husband does not enjoy his royalty, then all of their deceit and treachery has been for nothing.’
    • ‘Already on this very day this step of his is put down as one of the greatest acts of treachery in Hungary's history.’
    • ‘This was considered an act of treachery at a time when Britain was experiencing difficulties in North Afrika against Rommel's Afrika Korps.’
    • ‘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.’
    • ‘It is a story of intrigue, deception and treachery.’
    • ‘Here was one of my intellectual heroes committing an act of ideological treachery.’
    • ‘These are deliberate acts of treachery and are roundly condemned.’
    • ‘Pirates like Blackbeard have been feared and fabled for centuries in stories of treachery at sea and buried treasure.’
    • ‘The centuries that followed were full of intrigue and treachery.’
    • ‘Any threat to this peace must be treated as an act of treachery - a traitor's action.’
    • ‘Many of the local double as actors, and twice a week they play out their heritage, s story of love and treachery.’
    • ‘I am stunned at their casual treachery to this country, to humanity.’
    • ‘In Islamic folklore, however, they symbolize deceit, treachery, and adultery.’
    • ‘He accomplished this task by treachery, secrecy, speed and dishonesty.’
    • ‘From the perspective of Russian strategists, this proposal smacks of incredible stupidity or even treachery.’
    • ‘It would, therefore, have been an act of treachery not to speak on behalf on the people that he represented.’
    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
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Middle English: from Old French trecherie, from trechier ‘to cheat’.