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sly

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sly

  [slahy] adjective, sly⋅er or sli⋅er, sly⋅est or sli⋅est, noun
Use sly in a Sentence
–adjective
1. cunning or wily: sly as a fox.
2. stealthy, insidious, or secret.
3. playfully artful, mischievous, or roguish: sly humor.
—Idiom
4. on the sly, secretly; furtively: a tryst on the sly.
Origin:
1150–1200; ME sly, sley < ON slœgr sly, cunning

Related forms:
slyly, slily, adverb
slyness, noun

Synonyms:
1. artful, subtle, foxy, crafty, shrewd, astute. 2. surreptitious, furtive, underhand, clandestine.

Antonyms:
1. direct, obvious.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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sly   (slī)   
adj.   sli·er (slī'ər) also sly·er, sli·est (slī'ěst) also sly·est

  1. Clever or cunning, especially in the practice of deceit.

  2. Stealthy or surreptitious: took a sly look at the letter on the table.

  3. Playfully mischievous: a sly laugh.


[Middle English sleigh, from Old Norse slɶgr.]
sly'ly adv., sly'ness n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Idioms & Phrases

sly

see on the sly.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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