What term describes a wise person who shows keen judgment?

The term that describes a wise person who shows keen judgment is "sagacious." This word comes from the Latin "sagax," meaning having keen mental perception and understanding. Someone who is sagacious possesses insight and the ability to make sound decisions based on their knowledge and experience. This quality is often admired, as it reflects a depth of understanding and wisdom that helps guide choices and actions.

In contrast, the other options do not carry the same meaning. "Salacious" refers to something that is sexually provocative or lustful, which is unrelated to wisdom or judgment. "Sardonic" describes a scornful or mocking demeanor, indicating a type of wit that can be biting or contemptuous rather than wise or judicious. "Redress" means to remedy or set right a wrong, which focuses on rectification rather than the qualities of wisdom or judgment. Thus, "sagacious" is clearly the most fitting choice for someone who demonstrates wisdom and sound judgment.