One never knows what she has, sir: she is so cunning: it is not in mortal discretion to fathom her craft.
The lunatic is both cunning and malignant; she has never failed to take advantage of her guardian’s temporary lapses; once to secrete the knife with which she stabbed her brother, and twice to possess herself of the key of her cell, and issue therefrom in the night-time.
It is excusable, for she had a hard life of it: but still it was dangerous; for when Mrs. Poole was fast asleep after the gin and water, the mad lady, who was as cunning as a witch, would take the keys out of her pocket, let herself out of her chamber, and go roaming about the house, doing any wild mischief that came into her head.
There are no more uses of "cunning" in the book.
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She came up with a cunning scheme to cheat him.
The worst mix — greedy, cunning, and without morals.