Dictionary
sly
Pronunciation: (slī), [key]
—adj., sly•er or sli•er, sly•est or sli•est,
—n.
—
adj.
1. cunning or wily:
sly as a fox.
2. stealthy, insidious, or secret.
3. playfully artful, mischievous, or roguish:
sly humor.
—
n.
on the sly, secretly; furtively:
a tryst on the sly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.