agility (n.)

• acuity
• acuteness
• alacrity
• alertness
• attention
• attentiveness
• brightness
• briskness
• dispatch
• expedition
• expeditiousness
• keenness
• lightness
• nimbleness
• promptitude
• promptness
• punctuality
• quickness
• readiness
• sharpness
• sleeplessness
• smartness
• speediness
• swiftness
• wakefulness