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Synonyms
sly (slī)

[Middle English sleigh, from Old Norse slœgr.]

adjective: sli·er (slī́ər), also sly·er, sli·est (slī́ĕst), 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.

idioms

on the sly
In a way intended to escape notice: took extra payments on the sly.

derivatives

slýly
adverb
slýness
noun