Baka = This is the only real insult to intelligence in Japanese (being a super-polite people, even their insults are polite). In English, it can mean: (adj) stupid, foolish, unintelligent, dumb, dense, brainless, retarded, dull(-witted), slow(-witted), half-witted, simple(-minded), thick, dim, dopey, moronic, imbecilic, cretinous, thick, idiotic, silly, absurd, ridiculous, cock-eyed, daft. As a Noun, it means fool, idiot, nitwit, dunce, dullard, dunderhead, dolt, dim-wit, dope, thickhead, nincompoop, and so on and so forth.