slier or slyer; sliest or slyest
1
: clever in a dishonest way
a sly con man
a sly scheme
2
: showing that you know a secret
a sly wink/glance/smile
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“Sly.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/sly. Accessed 15 Jun. 2026.
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