DictionaryslyKnowing secrecy
adjective

sly

SLYE/slaɪ/

Cleverly concealing intentions, often playfully.

The sly player slips an extra token into his hand unnoticed.

During a casual tabletop game, a middle-aged man quietly slips an extra game token from a small supply dish into his closed hand while his older opponent looks down at the board.
Etymology

Old Norse slœgr meant “cunning” or “crafty,” but early English sly could praise someone as skillful, wise, or prudent. The deceitful sense turns that cleverness toward concealment and manipulation.

In context

JULIAN DOREY Clips1:14
And people who knew Cortés that he was kind of a sly dog started mocking the governor saying, "You know, governor, um you shouldn't trust Cortés.
The ONLY Spanish Conquistador Who Truly Understood South America | William Brown

More examples

  • She gave him a sly smile.
  • His sly remark hinted at the surprise.
  • The fox looked slyer than its clumsy pursuer in the cartoon.

Forms

sly · slyer · slyest · slier · sliest

Similar words

cunning
Cunning can sound more calculating or deceptive.
crafty
Crafty emphasizes skillful tricks rather than playful concealment.