/ Dictionary / Index S sly: Meaning and Definition of Find definitions for: sly Pronunciation: (slī), [key] — adj., n. sly•er sli•er, sly•est sli•est, —adj. cunning or wily: sly as a fox. stealthy, insidious, or secret. playfully artful, mischievous, or roguish: sly humor. —n. secretly; furtively: a tryst on the sly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sly (Thesaurus) slutty slyboots Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language