(a.) Light and quick in motion\; moving with ease and celerity; lively; swift.

active acute adroit agile alacritous alert alive apt attentive awake brainy breakneck bright brilliant brisk catty clever coruscating dashing deft dexterous dispatchful double-quick eagle-winged energetic expeditious express fast featly fleet flying galloping gifted graceful hair-trigger handy hasty headlong hustling intelligent keen keen-witted light light of heel light-footed lightsome limber lithe lively mercurial neat-fingered neat-handed nimble-footed nimble-witted no dumbbell not born yesterday on the on the alert on the ball on the job peart precipitate prompt qui vive quick quick as lightning quick as thought quick-thinking quick-witted rapid ready reckless running scintillating sharp sharp-witted sleepless smart snappy spanking sparkling speedy sprightly spry steel-trap sure-footed swift talented unblinking unnodding unsleeping unwinking vigilant wakeful watchful wide-awake winged zippy