brainless, dazed, deficient, dense, dim, dopey*, dull, dumb, dummy*, foolish, futile, gullible, half-baked*, half-witted*, idiotic, ill-advised, imbecilic, insane, indiscreet, insensate, irrelevant, laughable, loser*, ludicrous, meaningless, mindless, moronic, naive, nonsensical, obtuse, out to lunch, pointless, puerile, rash, senseless, shortsighted, simple, simpleminded, slow, sluggish, stolid, stupefied, thick, thick-headed, trivial, unintelligent, unthinking, witless
