25B6; adjective STUPID, foolish, silly, unintelligent, idiotic, brainless, witless, vacuous, vapid, feather-brained, birdbrained, scatterbrained, scatty, thoughtless; informal half-witted, dumb, dim, airheaded, brain-dead, dippy, dizzy, dopey, dozy, soft in the head, slow on the uptake; Brit. informal daft; N. Amer. informal ditzy, pantywaist.
intelligent.