- adj1. stupid, Inf. dumb, Inf. dopey, Inf. moronic, empty-headed, unintelligent, imbecilic, ox-like; dull, inexpressive, expressionless; addlepated, ad-dleheaded, addlebrained, muddled, muddleheaded; dull-witted, Sl. dimwitted, slow-witted, half-witted, witless, unwitty; mindless, Rare. insulse, brainless, fatuitous; dense, thick, bovine, obtuse, Boeotian, stolid, oafish, loutish, cloddish, lumpish, blunt; doltish, blockish, asslike, blockheaded, dunderheaded, noodleheaded; boneheaded, wooden-headed, thickheaded, thickskulled; obstinate, stubborn, intractable, mulish, obdurate, unyielding, unbending.2. idiotic, anserine, foolish; silly, absurd, inane, pointless, fatuous; nonsensical, senseless, crack-brained, Scot. doiled, Sl. cockeyed, Scot, and North Eng. glaikit; ridiculous, laughable, derisible, risible, ludicrous, Sl. for the birds; All Sl. balmy, dippy, batty, cuckoo, buggy, screwy, wacky, goofy, loony.3. incautious, imprudent, indiscreet, irresponsible, injudicious; unwise, ill-considered, ill-suited, ill-advised, impolitic; impetuous, impulsive, hasty, shortsighted, heedless, unheeding; foolhardy, headlong, rash, brash, unwary; reckless, careless, thoughtless.
A Note on the Style of the synonym finder. 2014.