Breadcrumb Home > 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 TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: peremptory Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language