shrewd

Part of speech: adverb

Shrewdly.

Part of speech: noun

Shrewdness.

Part of speech: adjective

Keen; sharp; sagacious.

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Usage examples "shrewd":

  1. Playing a shrewd game! - "The Lesser Bourgeoisie", Honore de Balzac.
  2. But he had become a part of the machine, was shrewd, and, with the machine behind him, was a power. - "A Man and a Woman", Stanley Waterloo.
  3. She said this because she had a shrewd idea of how matters were likely to turn out. - "The Fat and the Thin", Emile Zola.