Adjective shrewd has 2 senses
  1. astute, sharp, shrewd - marked by practical hardheaded intelligence; "a smart businessman"; "an astute tenant always reads the small print in a lease"; "he was too shrewd to go along with them on a road that could lead only to their overthrow"
    Antonym: stupid (indirect, via smart)
  2. calculating, calculative, conniving, scheming, shrewd - used of persons; "the most calculating and selfish men in the community"
    Antonym: soft (indirect, via hard)
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