sly Definition in the Cambridge English Dictionary
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Definition of “sly” - English Dictionary

Definition of "sly" - American English Dictionary

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slyadjective

 us   /slɑɪ/ (comparative slyer, superlative slyest)
not ​lettingothersknowtrueopinions or ​intentions, or ​dishonest: She ​thought that by being sly, she could ​foolpeople. A ​cat can be a very sly ​animal.
slyly
adverb  us   /ˈslɑɪ·li/
He ​winked slyly and ​lowered his ​voice, as if he had some ​secret to ​reveal.
(Definition of sly from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "sly" - British English Dictionary

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slyadjective

uk   us   /slaɪ/ (slyer, slyest)
deceivingpeople in a ​clever way in ​order to get what you ​want: He's a sly ​olddevil - I wouldn't ​trust him with my ​money. [before noun] seeming to ​knowsecrets: "You'll ​find out ​eventually," said Mary, with a sly smile.
slyly
adverb uk   us   /ˈslaɪ.li/
She ​grinned slyly and ​refused to ​tell me where the ​money came from.
slyness
noun [U] uk   us   /ˈslaɪ.nəs/

slynoun

uk   us   /slaɪ/
on the sly If you do something on the sly, you do it ​secretly because you should not be doing it: He ​drives his mother's ​car on the sly while she's at ​work.
(Definition of sly from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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