Synonyms of sly in English:

sly

adjective

  • 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
    Australian/New Zealand informal shonky
    South African informal slim
    archaic subtle
    rare carny
    [Antonyms] honest artless
  • 2 he gave her a sly grin
    roguish, mischievous, impish, puckish, playful, teasing, naughty, wicked, waggish; arch, knowing
    Scottish & Northern English informal pawky
  • 3 she took a sly sip of water
  • noun

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    Phrases

    on the sly

    is she meeting some other guy on the sly?
    [Antonyms] openly
    in secretsecretlyfurtivelystealthilysneakilyslylysurreptitiouslycovertlyclandestinelyon the quieton the sidebehind someone's backunder coverunder the counter informalon the q.t.

    Definition of sly in:

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