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Use "slyness" in a sentence
""But when their slyness is known their case is mortal," said Longarine."
"At such times there is no trace of hatred or spite in his eyes, but a great deal of humour, and that peculiar fox-like slyness which is only to be noticed in very observant people."
"And -- most important -- the emotion (a kind of slyness) that came to him from the "noise" in the being's brain."