Syn: -- Keen; critical; subtle; artful; astute; sagacious; discerning; acute; penetrating. Usage: Shrewd, Sagacious. One who is shrewd is keen to detect errors, ...
shrewd, sagacious, perspicacious, astute mean acute in perception and sound in judgment. shrewd stresses practical, hardheaded cleverness and judgment.
shrewd in American English · 1. astute or sharp in practical matters. a shrewd politician · 2. keen; piercing · 3. artful · 4. archaic. malicious · 5. obsolete.