Synonyms and related words :
agile, breakneck, dashing, double-quick, eagle-winged, expeditious, express, fast, featly, fleet, flying, galloping, graceful, hair-trigger, hasty, headlong, hustling, light, light of heel, lively, mercurial, neat-fingered, neat-handed, nimble, nimble-footed, peart, precipitate, prompt, quick, quick as lightning, quick as thought, rapid, reckless, running, snappy, spanking, speedy, sprightly, spry, sure-footed, swift, winged