BRAINY Meaning of BRAINY in English — brainily , adv. — braininess , n./bray"nee/ , adj., brainier, brainiest . Informal.intelligent; clever; intellectual. [ 1835-45; BRAIN + -Y 1 ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012