highbrow

cultivated, cultured

middlebrow

erudite, learned, literate, polyhistoric, polymath (or polymathic), scholarly, well-read

academic (also academical), bookish, professorial

didactic, high-toned, hyperintellectual, pedantic

high-hat, snobbish, snobby, snooty

educated, schooled

brainy, bright, brilliant, clever, intelligent, quick-witted, smart

blue, bluestocking

Brahmin, mandarin, sage

intellectualizer, pseud [British]

brain, genius, intellect, thinker, whiz, wizard