sly

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sly /ˈslaɪ/ adjective
slier or slyer; sliest or slyest
sly
/ˈslaɪ/
adjective
slier or slyer; sliest or slyest
Learner's definition of SLY
[also more sly; most sly]
: clever in a dishonest way
: showing that you know a secret

on the sly

informal
: in a secret way

— slyness

noun [noncount]
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