Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Old Norse
Origin: slœgr

sly

adjective
     
sly
1 someone who is sly cleverly deceives people in order to get what they want [= cunning]
2

sly smile/glance/wink etc

a smile, look etc that shows you know something secret:
He leaned forward with a sly smile.
3

on the sly

informal secretly, especially when you are doing something that you should not do:
They'd been seeing each other on the sly for months.
slyly adverb
slyness noun [uncountable]

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