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treachery

/ˈtɹɛt͡ʃəɹi/ noun C2
  1. Deliberate, often calculated, disregard for trust or faith. (countable, uncountable)
  2. The act of violating the confidence of another, usually for personal gain. (countable, uncountable)
  3. Treason. (countable, uncountable)
  4. An act or instance of treachery. (countable)

Plural treacheries

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From the library

Therefore being condemned by each for his treachery, he was driven forth from the light of day, and henceforth concealed himself in dark hiding-places, flying always alone and at night.
Three Hundred Aesop's Fables, p. 84 · B2
I said I looked upon it as a sacrilegious profanation to reward treachery, perhaps crime.”
The Count of Monte Cristo, p. 294 · C1
“I perfectly well remember Perugia, sir, and the Hôtel des Postes, and the festival of which you speak,” said Madame de Villefort, “but in vain do I tax my memory, of whose treachery I am ashamed, for I really do not recall to mind that I ever had the pleasure of seeing you before.”
The Count of Monte Cristo, p. 518 · C1
“Wretch!” exclaimed Haydée, her eyes flashing with rage; “he sold my father to the Turks, and the fortune he boasts of was the price of his treachery!
The Count of Monte Cristo, p. 560 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.