Synonyms of shrewd

Adjective

1. astute, sharp, shrewd, smart (vs. stupid)

usage: 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"

2. calculating, calculative, conniving, scheming, shrewd, hard (vs. soft)

usage: used of persons; "the most calculating and selfish men in the community"

Definition and meaning of shrewd (Dictionary)