Barmy, absurd, and asinine are all synonyms for stupid. Intelligent, clever, astute, sensible, and prudent are antonyms of stupid. And here are 102 another word for stupid.
Absurd, asinine, barmy, batty, birdbrained, boneheaded, bovine, brain-dead, brainless, chuckleheaded, cock-eyed, crackbrained, cracked, crazy, cretinous, cuckoo, daft, damfool, dense, derpy, dim, doltish, dopey, dotty, dozy, dull-witted, dull, dumb, dunce-like, dunderheaded, empty-headed, fat-headed, fatuous, foolish, fruitless, futile, gormless, gullible, half-baked, half-witted, hare-brained, idiotic, ignorant, ill-advised, ill-considered, imbecile, imbecilic, inane, indiscreet, inept, injudicious, insane, irresponsible, lamebrained, laughable, loony, loopy, ludicrous, lunatic, mad, meaningless, mindless, moronic, muttonheaded, naive, nonsensical, not the full shilling, nutty, obtuse, off one's head, off one's trolley, out to lunch, pea-brained, pig-ignorant, pointless, potty, ridiculous, risible, scatterbrained, screwy, senseless, short-sighted, silly, simple-minded, slow on the uptake, slow-witted, slow, soft in the head, thick as two short planks, thick, thickheaded, unintelligent, unthinking, unwise, vacuous, vapid, witless, wooden-headed, wooden, zany, and glaikit are all synonyms for stupid.
Stupid synonym page has a variety of synonyms that differ in length. 2 synonyms with 3, and 14 letters and 6 synonyms with 4, 8, and 12 letters. 17 synonyms with 5 letters and 9 synonyms with 6 letters.
12 synonyms with 7, and 9 letters and 10 synonyms with 10, and 11 letters. 5 synonyms with 13 letters and 1 synonym with 15, 18, and 21 letters. For a total of 100 another word for stupid.
That was a stupid idea.
He's acting really stupid today.
Stop making stupid mistakes, please.
It's a stupid, pointless argument.