• WordNet 3.6
    • n slyness shrewdness as demonstrated by being skilled in deception
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Webster's Revised Unabridged Dictionary
    • n Slyness The quality or state of being sly.
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Century Dictionary and Cyclopedia
    • n slyness The quality of being sly, or conduct that is sly, in any sense; craftiness; arch or artful wiliness; cunning, especially satirical or playful cunning; archness; the use of wiles or stratagems, or the quality inclining one to use them.
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In literature:

In reply, Murat, whether from slyness or from a desire to gain time, requested a formal, written demand to that effect.
"The Life of Napoleon Bonaparte" by William Milligan Sloane
He was a slow-speaking Norman, with plenty of slyness under an appearance of good nature.
"The Red True Story Book" by Various
With her usual slyness, she kept her own counsel.
"Marjorie Dean" by Pauline Lester
Indeed I wasn', an' ye needn' be t'rowin' anny o' yer slyness on me.
"Dr. Sevier" by George W. Cable
Oh, the slyness o' him!
"The Spoilers of the Valley" by Robert Watson
But there was more of slyness than bitterness in his tone.
"Dave Porter At Bear Camp" by Edward Stratemeyer
A gleam of gratified slyness lit up the haggardness of Northwick's face.
"The Quality of Mercy" by W. D. Howells
This, with a sort of quiet slyness, Rufe told me at an early period of our acquaintance.
"The Works of Robert Louis Stevenson - Swanston Edition" by Robert Louis Stevenson
I suppose, dear Laskowski, that no one has ever doubted your slyness.
"The German Classics, v. 20" by Various
But slyness seems the fashion.
"The Complete Project Gutenberg Works of Jane Austen" by Jane Austen

In poetry:

But now I walk within a town,
And hear the slyness of its feet.
Great cruel things stride up and down
Within a shady street.
"The Change" by Leon Gellert