adj. 25B6; adjective STUPID, FOOLISH, witless, unintelligent, ignorant, idiotic, simple-minded, empty-headed, half-baked; informal dumb, half-witted, brain-dead, moronic, cretinous, thick, dopey, dozy, birdbrained, pea-brained, dippy, wooden-headed; Brit. informal divvy; Scottish & N. English informal glaikit; N. Amer. informal chowderheaded.
clever.