|—adj , slyer, slyest, slier, sliest|
|1.||crafty; artful: a sly dodge|
|2.||insidious; furtive: a sly manner|
|3.||playfully mischievous; roguish: sly humour|
|4.||on the sly in a secretive manner|
|[C12: from Old Norse slǣgr clever, literally: able to strike, from slā to |
see on the sly.