Definitions: (1) possessing quick intelligence; mentally alert; shrewd; brilliant; (2) capable and practiced know-how; astute; clever; (3) brisk, lively, or witty <as an insightful remark>; (4) neat and clean with a fresh flair; in contemporary style; (5) sophisticated; elegant; fashionable

• A smart man makes a mistake, learns from it, and never makes that mistake again. But a wise man finds a smart man and learns from him how to avoid the mistake altogether. — Roy Holster Williams (1958-) American author & marketing consultant
• The kind of people that all teams need are people who are humble, hungry, and smart. Humble being little ego; focusing more on their teammates than on themselves. Hungry meaning they have a strong work ethic; determined to get things done and contribute any way they can. Smart meaning inner personally smart. — Patrick Lencioni (1965-) American management author