n. 25B6; noun
the world knew of his genius : BRILLIANCE, intelligence, intellect, ability, cleverness, brains, erudition, wisdom, fine mind; artistry, flair.
he has a genius for organization : TALENT, gift, flair, aptitude, facility, knack, bent, ability, expertise, capacity, faculty; strength, forte, brilliance, skill, artistry.
he is a genius : BRILLIANT PERSON, gifted person, mastermind, Einstein, intellectual, great intellect, brain; prodigy; informal egghead, bright spark; Brit. informal brainbox, clever clogs; N. Amer. informal brainiac, rocket scientist.
stupidity, dunce.