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English definition of “sly”

sly

adjective     /slaɪ/ (slyer, slyest)
deceiving people in a clever way in order to get what you want : He's a sly old devil - I wouldn't trust him with my money .Secrecy and privacy [before noun] seeming to know secrets : "You'll find out eventually ," said Mary with a sly smile .Secrecy and privacy slyly     /ˈslaɪ.li/ adverb She grinned slyly and refused to tell me where the money came from.Secrecy and privacy slyness     /ˈslaɪ.nəs/ noun [U] Secrecy and privacy
(Definition of sly adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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