quick-witted

Synonyms: acute agile alert apt astute brainy bright brilliant canny clever facetious humorous intelligent keen knowing nimble-witted on the ball penetrating penetrative perceptive prompt quick quick on the draw quick on the uptake ready savvy sharp sharp as a tack sharp-sighted sharp-witted shrewd slick whiz wired wise witty

Antonyms: slow slow-witted stupid uneducated