illiterate, uninformed, brainless, uneducated, simple, unlearned, foolish, mindless, unintelligent, ignorant.

mindless, unthinking, brainless, blank, unreasonable, thoughtless, unoccupied, unthoughtful, fatuous, illogical, vacuous, inane, vacant.

empty, faint, whacky, goofy, thickheaded, dense, obtuse, brain-dead, doltish, opaque, bubbleheaded, giddy, ability, thick, frivolous, dim, silly, cockamamie, swooning, zany, frothy, dizzy, lighthearted, dull, cockamamy, lunkheaded, harebrained, knuckleheaded, light-headed, pathetic, scatterbrained, dorky, dopey, wacky, idiotic, weak-minded, lamebrain, lightheaded, witless, punch-drunk, thick-witted, soft, airheaded, dunderheaded, half-witted, senseless, unsmart, slaphappy, ridiculous, pinheaded, dumb, featherbrained, vertiginous, softheaded, woozy, light, chuckleheaded, boneheaded, gaga, simple-minded, slow-witted, slow, stupid, bonehead, gormless, oafish, sappy, flighty, birdbrained, dim-witted, full.