INANE

adj. silly, asinine, vapid, vacant, vacuous, absurd, fatuous, foolish, senseless, nonsensical, unreasonable, preposterous, ludicrous, ridiculous, laughable, risible, mad, lunatic, crazy, stupid, dumb, idiotic, moronic, imbecilic, Colloq nutty, nuts, daft, daffy, screwy, batty, dippy, wacky, cuckoo, loony, goofy, Brit bonkers, dotty Students seem especially prone to inane behaviour