Synonyms to on the ball

advertent, agog, alert, all ears, all eyes, assiduous, attentive, aware, careful, concentrated, conscious, diligent, earnest, finical, finicking, finicky, heedful, intense, intent, intentive, meticulous, mindful, nice, niggling, observant, observing, on the job, open-eared, open-eyed, openmouthed, regardful, watchful, agile, active, acute, adroit, alacritous, alive, awake, breakneck, bright, brisk, catty, dashing, deft, dexterous, dextrous, dispatchful, double-quick, eagle-winged, expeditious, express, fast, featly, fleet, flying, galloping, graceful, hair-trigger, hasty, headlong, hustling, keen, light, light of heel, light-footed, limber, lissome, lithe, lively, mercurial, neat-fingered, neat-handed, nimble, nimble-footed, on the, on the alert, peart, precipitate, prompt, qui vive, quick, quick as lightning, quick as thought, rapid, ready, reckless, resourceful, running, sharp, sleepless, smart, snappy, spanking, speedy, sprightly, spry, supple, sure-footed, swift, tripping, unblinking, unnodding, unsleeping, unwinking, volant, wakeful, wide-awake, winged, zippy, a