Synonyms of sly in English:

sly

adjective

  • 1 she's rather sly
  • 2 a sly grin
  • 3 she took a sly sip of water
    surreptitious, furtive, stealthy, covert
  • Phrases

    on the sly

    he's dating Peggy on the slyin secretsecretlyfurtivelysurreptitiouslycovertlyclandestinelyon the quietbehind someone's back informalon the QT

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