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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. Clever or cunning, especially in the practice of deceit.
  2. adj. Stealthy or surreptitious: took a sly look at the letter on the table.
  3. adj. Playfully mischievous: a sly laugh.
  4. idiom. on the sly In a way intended to escape notice: took extra payments on the sly.

Century Dictionary and Cyclopedia

  1. . Cunning; skilful; shrewd.
  2. Meanly artful; insidious; crafty.
  3. Playfully artful; knowing; having an intentionally transparent artfulness.
  4. Artfully and delicately wrought; cunning; ingenious.
  5. Thin; fine; slight; slender.
  6. Illicit: as, sly grog (liquor made in illicit stills).
  7. Synonyms and
  8. Cunning, Artful, Sly, etc. (sec cunning).
  9. Roguish, playful, waggish.

Wiktionary

  1. adj. Artfully cunning; secretly mischievous; wily.
  2. adj. Dexterous in performing an action, so as to escape notice; nimble; skillful; cautious; shrewd; knowing; — in a good sense.
  3. adj. Done with, and marked by, artful and dexterous secrecy; subtle; as, a sly trick.
  4. adj. Light or delicate; slight; thin.
  5. adv. Slyly.

GNU Webster's 1913

  1. adj. Dexterous in performing an action, so as to escape notice; nimble; skillful; cautious; shrewd; knowing; -- in a good sense.
  2. adj. Artfully cunning; secretly mischievous; wily.
  3. adj. Done with, and marked by, artful and dexterous secrecy; subtle.
  4. adj. Light or delicate; slight; thin.
  5. adv. Slyly.

WordNet 3.0

  1. adj. marked by skill in deception

Etymologies

  1. Middle English sleigh, from Old Norse slœgr.

Examples

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‘sly’ has been looked up 2259 times, loved by 2 people, added to 44 lists, and has a Scrabble score of 6.