Here's a list of synonyms for the word "stupid". If everyone uses one of these instead of "gay" not only will it make the world a better, happier place, but you'll expand your vocabulary.
stupid adjective 1 they're rather stupid unintelligent, ignorant, dense, foolish, dull-witted, slow, simpleminded, vacuous, vapid, idiotic, imbecilic, imbecile, obtuse, doltish; informal thick, dim, dimwitted, dumb, dopey, dozy, moronic, cretinous, pea-brained, halfwitted, soft in the head, brain-dead, boneheaded, thickheaded, wooden-headed, muttonheaded, daft. antonym intelligent.
2 that was a really stupid thing to do foolish, silly, unintelligent, idiotic, scatterbrained, nonsensical, senseless, unthinking, ill-advised, ill-considered, unwise, injudicious; inane, absurd, ludicrous, ridiculous, laughable, risible, fatuous, asinine, mad, insane, lunatic; informal crazy, dopey, cracked, half-baked, dimwitted, cockeyed, harebrained, lamebrained, nutty, batty, cuckoo, loony, loopy. antonym sensible.
3 he drank himself stupid into a stupor, into a daze, into oblivion; stupefied, dazed, unconscious. antonym alert.