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sly

adjective
 
 
/slaɪ/ (slyer, slyest)

Definition

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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