quick

Synonyms: abrupt accelerated active agile alert a move on animated asap breakneck brief brisk cursory curt double time energetic expeditious expeditive express fleet flying going harefooted hasty headlong hurried immediate impatient impetuous instantaneous keen lively mercurial move it nimble on the double perfunctory posthaste prompt pronto rapid snappy spirited sprightly spry sudden swift the lead out winged

Antonyms: lazy slow sluggish

Synonyms: able active acute adept adroit all there apt astute bright canny capable clever competent deft dexterous discerning effective effectual intelligent keen knowing nimble-witted on the ball perceptive perspicacious prompt quick on the draw quick on the trigger quick on the uptake quick-witted ready receptive savvy sharp sharp as a tack shrewd skillful slick smart as a whip vigorous whiz wired wise

Antonyms: ignorant slow stupid uneducated