Dictionary![]() ![]() slyPronunciation: (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.
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