quick

This word emphasizes the speed of an action or the brevity of a duration. It often carries a sense of efficiency or urgency, suggesting a lack of delay. When applied to a person's mind, it suggests agility and sharpness rather than just physical velocity. In contrast to fast, which often describes a constant state or a high-velocity capability (like a fast car), quick frequently refers to a single, momentary action or a rapid reaction. It is common in casual and professional settings to describe tasks that are intentionally kept short to save time.