One of the mysteries of the English language finally explained.
1‘she's getting sly in her old age’
cunning, crafty, clever, wily, artful, guileful, tricky, conniving, scheming, devious, designing, deceitful, duplicitous, dishonest, disingenuous, underhand, sneaky, untrustworthy
manipulative, calculating, Machiavellian
informal foxy, shifty
British informal fly
NZ Australian informal shonky
South African informal slim
2‘he gave her a sly grin’
roguish, mischievous, impish, puckish, playful, teasing, naughty, wicked, waggish
Northern English Scottish informal pawky
3‘she took a sly sip of water’
surreptitious, furtive, stealthy, covert, secret
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