Stupid
Unintelligent
Synonyms: Unintelligent, dense, mindless, dull-witted, slow-witted, slow, simple-minded, vacuous, half-witted, moronic, imbecile, doltish, naive, dim, dopey, crazy, birdbrained, pig-ignorant, slow on the uptake, brain-dead, lamebrained, chuckleheaded, wooden, fat-headed, daft, not the full shilling, silly, crackbrained, senseless, unthinking, ill-considered, damfool, injudicious, short-sighted, absurd, ridiculous, risible, asinine, meaningless, fruitless, insane, cracked, cock-eyed, nutty, cuckoo, loopy, screwy, off one's trolley, potty, batty, glaikit, ignorant, brainless, foolish, dull, witless, dunce-like, empty-headed, vapid, idiotic, imbecilic, obtuse, gullible, thick, dumb, dozy, cretinous, pea-brained, bovine, soft in the head, boneheaded, thickheaded, dunderheaded, wooden-headed, muttonheaded, barmy, thick as two short planks, scatterbrained, nonsensical, irresponsible, ill-advised, inept, unwise, indiscreet, inane, ludicrous, laughable, fatuous, pointless, futile, mad, lunatic, half-baked, hare-brained, derpy, loony, zany, off one's head, out to lunch, dotty, and gormless.
Example Sentences
That was a stupid idea.
He's acting really stupid today.
Stop making stupid mistakes, please.
It's a stupid, pointless argument.