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 "wary" in the book.
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She was taught to be wary of strangers.
She looked wary as she reached out to pet her friend’s new dog.