the GNU version of the Collaborative International Dictionary of English
n. The quality or state of being sly.
The Century Dictionary and Cyclopedia
n. 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.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. shrewdness as demonstrated by being skilled in deception
Word Usage
""But when their slyness is known their case is mortal," said Longarine."