Characterized by great celerity:
breakneck, expeditious, fast, fleet, quick, rapid, speedy, swift. Idiom: quick as a bunny (or wink). See fastIn a rapid way:
apace, fast, posthaste, quick, quickly. (Informal) flat out, lickety-split, pronto. Idioms: full tilt, in a flash, in nothing flat, like a bat out of hell, like a blue streak, like a flash, like a house on fire, like a shot, like a streak, like greased lightning, like the wind, like wildfire. See fast
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