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Definition of: sly
(slī) adjective sli·er or sly·er, sli·est or sly·est
1. Artfully dexterous in doing things secretly; cunning in evading notice or detection.
2. Playfully clever; roguish; mischievous.
3. Meanly or stealthily clever; crafty.
4. Done with or marked by artful secrecy: a sly trick.
5. Skilful; possessed of practical ability; wise. See synonyms under INSIDIOUS.
—on the sly In a stealthy way; with concealment. [<ON slægr]
—sly′ness noun
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