shrewd   (Sound)

The adj shrewd has 2 senses

• 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")


• calculating, calculative, conniving, scheming, shrewd -- (used of persons; "the most calculating and selfish men in the community")