Meaning of sly

sly

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