Synonym: artful, canny, clever, crafty, cunning, shifty, shrewd, smooth, sneaky, tricky, underhanded. Antonym: frank. Similar words: slyly, slyness, piously, callously, uselessly, raucously, curiously, dubiously. Meaning: [slaɪ] 
adj. marked by skill in deception.
adj. marked by skill in deception. 
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(1) She was sly, selfish, and manipulative.
(2) He's a cunning/sly/wily old fox.
(3) He leaned forward with a sly smile.
(4) People consider foxes as clever but sly animals.
(5) He's a sly old fox.
(6) His lips were spread in a sly smile.
(7) He was a sly old fox.
(8) His manner was sly and deceitful.
(9) You sly old devil!
(10) He's a sly old devil - I wouldn't trust him with my money.
(11) She is devious and sly and manipulative.
(12) She must have been having lessons on the sly.
(13) She darted a sly sideways glance at Bramwell.
(14) He looked sly and furtive.
(15) A sly smile crept over her lips.
(16) He has to visit them on the sly.
(17) You can't trust him; he's a sly old fox.
(18) He cast a sly glance at his bridge partner.
(19) She cast a sly glance at her bridge partner.
(20) Brooks is a sly dog.
(21) He kept making sly little digs at me.
(22) He is a sly dog.
(23) You sly old devil! How long have you known?
(24) They'd been seeing each other on the sly for months.
(25) I resisted the temptation to get in a sly dig at Fred.
(26) The fruit seller was sly - he put his best fruit in front but gave people bad ones from behind.
(27) He drives his mother's car on the sly while she's at work.
(28) It was sly of you not to tell us you'd already met.
(29) "You'll find out eventually(sentencedict.com/sly.html), " said Mary with a sly smile.
(30) Her tale has a consciously youthful tone and storyline, combined with a sly humour.
More similar words: slyly, slyness, piously, callously, uselessly, raucously, curiously, dubiously, piteously, obviously, endlessly, enormously, expressly, furiously, nervously, jealously, riotously, copiously, viciously, anxiously, arduously, tediously, carelessly, zealously, tactlessly, vigorously, cautiously, recklessly, tirelessly, notoriously.