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Adjective: shrewd (shrewder,shrewdest)  shrood
  1. Marked by practical hardheaded intelligence
    "he was too shrewd to go along with them on a road that could lead only to their overthrow";
    - astute, sharp, argute [literary], savvy [informal]
  2. Serving one's own interests in an unemotional, analytical manner
    "the most shrewd and selfish men in the community";
    - calculating, calculative, conniving, scheming

Derived forms: shrewdest, shrewder

See also: hard, smart