Variant of sly
- Dialectal skillful or clever
- skillful at trickery or deceit; crafty; wily
- showing a secretive, crafty, or wily nature; cunningly underhanded
- mischievous in a playful way; roguish
Origin: Middle English sley from Old Norse slœgr, clever, cunning, literally , able to strike from base of slā and amp; Old English slean, to strike: see slay
Used by arrangement with John Wiley & Sons, Inc.