quick
1 active, brief, brisk, cursory, expeditious, express, fast, fleet, hasty, headlong, hurried, pdq (slang) perfunctory, prompt, quickie (informal) rapid, speedy, sudden, swift
2 agile, alert, animated, energetic, flying, keen, lively, nimble, spirited, sprightly, spry, vivacious, winged
3 able, acute, adept, adroit, all there (informal) apt, astute, bright (informal) clever, deft, dexterous, discerning, intelligent, nimble-witted, perceptive, quick on the uptake (informal) quick-witted, receptive, sharp, shrewd, skilful, smart
4 abrupt, curt, excitable, hasty, impatient, irascible, irritable, passionate, petulant, testy, touchy
5 (archaic) alive, animate, existing, live, living, viable
Antonyms
2 dull, heavy, inactive, lazy, lethargic, slow, sluggish, unresponsive
3 inexpert, maladroit, stupid, unintelligent, unskilful
4 calm, deliberate, patient, restrained
quick-tempered
cantankerous, choleric, excitable, fiery, hot-tempered, impatient, impulsive, irascible, irritable, petulant, quarrelsome, ratty (Brit. & N.Z. informal) shrewish, splenetic, testy, tetchy, waspish
Antonyms
cool, dispassionate, phlegmatic, placid, slow to anger, tolerant
quick-witted
alert, astute, bright (informal) clever, keen, perceptive, sharp, shrewd, smart
Antonyms
dull, obtuse, slow, slow-witted, stupid, thick (informal) unperceptive