Synonyms for Quick-witted:

adj.

sharp (adjective)
alert, humorous.
smart (adjective)
clever, quick, intelligent, facetious, wise, humorous, alert, witty, brilliant, shrewd, sharp, canny, astute, Sharp-witted.
witty (adjective)
dry, comical, scurrilous, urbane, sly, funny, quick, witty, droll, clever, sharp, waggish, adroit, cunning, foxy, sarcastic, shrewd, joking, pithy, artful, inventive, subtle, brilliant, canny, sophisticated, deft, jocular, scintillating, smart, ingenious, astute, pointed, wily, intelligent, sparkling, facetious, tricky, crafty, resourceful.

n.

clear-sighted, wise, discerning, academic. alert, Sharp-witted, smart as a whip, ability.

Other synonyms:

Sharp-witted. alert. Other relevant words:
discerning, wise, alert, humorous, Sharp-witted, clear-sighted, smart as a whip.