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sly

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sly/ˈslaɪ/adjective
slierorslyersliestorslyest
sly
/ˈslaɪ/
adjective
slierorslyersliestorslyest
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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