Sagacious means wise and showing excellent judgment, especially in practical matters. A sagacious person doesn't just know facts; they understand situations deeply and make smart decisions based on that understanding.

When a coach makes a sagacious choice about which player to put in during a crucial moment, she's drawing on experience, careful observation, and sharp thinking. When someone offers sagacious advice about handling a difficult friendship, they've thought through the situation from multiple angles and understood what really matters.

The word suggests more than ordinary intelligence. A student might be smart enough to memorize every state capital, but a sagacious student knows when to speak up in class and when to listen, or how to solve a problem between friends before it gets worse. Sagacious people seem to see around corners, anticipating what might happen next.

Related words include wise, shrewd, and perceptive. Someone described as sagacious has earned that reputation through good judgment over time. You might call an experienced teacher sagacious for knowing exactly how to help a struggling student, or admire a grandparent's sagacious understanding of people and situations.