Englishquick-witted
adjective
alert, astute, perceptive, quick, quick-thinking, sharp-witted, sharp, shrewd, penetrating, discerning, perspicacious;
wide awake, ready, quick off the mark, observant;
intelligent, bright, clever, gifted, able, brainy, brilliant;
informal smart, on the ball, on one's toes, quick on the uptake, genius;
North American, informal whip-smart.
▷antonyms stupid, slow.