shrewd implies keenness of mind, sharp insight, and a cleverness in practical matters a shrewd comment, businessman, etc.; sagacious implies keen discernment and farsighted judgment a sagacious counselor; perspicacious suggests the penetrating mental vision or discernment that enables one clearly to see and understand what is obscure, hidden, etc. a perspicacious judge of character; astute implies shrewdness combined with sagacity and sometimes connotes, in addition, artfulness or cunning an astute politician See also syn. study at clever.
See shrewd in Webster's New World Roget's A-Z Thesaurus II
See shrewd in American Heritage Dictionary 4 Synonyms
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