1. the quality of being fast in movement or action; speed
2. the ability to understand or respond rapidly; mental agility

Examples

• The athlete’s quickness on the field impressed the coaches.
• She moved with surprising quickness for someone her age.
• His quickness of mind helped him solve the puzzle immediately.
• The cat’s quickness allowed it to catch the mouse.
• I admired her quickness in responding to difficult questions.
• The boxer’s quickness made him hard to hit.
• Her quickness of wit made her popular at parties.