alacritous

having or showing the ability to respond without delay or hesitation his alacritous response to every request is “Right away, mate!” Synonyms quick, alert, expeditious, prompt, ready, willingRelated Words receptive, responsive; immediate, instant, instantaneous, summary; breakneck, breathless, brisk, fast, fleet, fleet-footed, hit-and-run, lightning, rapid, rapid-fire, rattling, snappy, speedy, swift, whirlwind; eager, keen, sharp; apt, clever, quick, quick-witted, ready-witted, sharp-witted, smartNear Antonyms unresponsive; crawling, creeping, dallying, dawdling, dilatory, dillydallying, dragging, laggard, lagging, lazy, lazyish, leisurely, logy (also loggy), poking, poky (or pokey), slothful, slow, slowish, sluggish, tardy, unhurried; dormant, idle, inactive, inert