1. speedy Nimble refers to lightness, freedom, and quickness of motion within a somewhat narrow range, with readiness to turn suddenly to any point; swift applies commonly to more sustained motion over gre Synonyms: nimble, active, alert, bustling, prompt, speedy, spry, agile, brisk, lively, quick, sprightly, swift Antonyms: clumsy, dull, heavy, inactive, inert, slow, sluggish, unready, dilatory