Smartly means doing something in a quick, energetic, and efficient way. When a soldier salutes smartly, their hand snaps up crisply to their forehead. When you respond smartly to a question, you answer quickly and confidently without hesitation.

The word suggests sharpness and precision in action. A well-trained dog sits smartly when commanded, dropping into position immediately. A student who completes their homework smartly works through it with focus and speed, not dawdling or getting distracted.

Smartly can also describe dressing in a neat, stylish way. Someone dressed smartly for an interview wears clean, well-fitted clothes that make a good impression. A smartly dressed person looks put-together and professional.

Notice how the word connects to alertness and brightness in both meanings. Whether you're moving smartly through your morning routine or dressing smartly for a special occasion, you're showing attention, care, and energy. The opposite would be moving sluggishly or dressing sloppily.