Synonyms and related words :
acuity, acuteness, adroitness, agility, alacrity, alertness, aptitude, aptness, attention, attentiveness, braininess, brightness, brilliance, briskness, clear thinking, cleverness, dexterity, dispatch, esprit, expedition, expeditiousness, featliness, flair, genius, giftedness, gifts, keen-wittedness, keenness, lightness, mental alertness, mercurial mind, native cleverness, nimble mind, nimble-wittedness, nous, promptitude, promptness, punctuality, quick parts, quick thinking, quick wit, quick-wittedness, quickness, readiness, ready wit, savvy, sharp-wittedness, sharpness, sleeplessness, smartness, smarts, speediness, sprightly wit, spryness, swiftness, talent, wakefulness