She could not endure the idea of treachery or levity, or anything akin to ill usage between him and his friend.
Mr Elliot is a man without heart or conscience; a designing, wary, cold-blooded being, who thinks only of himself; whom for his own interest or ease, would be guilty of any cruelty, or any treachery, that could be perpetrated without risk of his general character.
There are no more uses of "treachery" in the book.
Show samples from other sources
Benedict Arnold remains the U.S.’s symbol of ultimate treachery.
She was going to get an award for bravery when she should really be kicked out of the Smoke for treachery.