Here's some:
stupid=
having or showing a great lack of intelligence or common sense.
"I was stupid enough to think she was perfect"
synonyms: unintelligent, ignorant, dense, foolish, dull-witted, slow, simpleminded, vacuous, vapid, idiotic, imbecilic, imbecile, obtuse, doltish; informalthick, dim, dimwitted, slow-witted, dumb, dopey, dozy, moronic, cretinous, pea-brained, halfwitted, soft in the head, brain-dead, boneheaded, thickheaded, wooden-headed, muttonheaded, daft
"they're rather stupid"
•foolish, silly, unintelligent, idiotic, scatterbrained, nonsensical, senseless, harebrained, unthinking, ill-advised, ill-considered, unwise, injudicious;
inane, absurd, ludicrous, ridiculous, laughable, risible, fatuous, asinine, mad, insane, lunatic;
informal: crazy, dopey, cracked, half-baked, dimwitted, cockeyed, lamebrained, nutty, batty, cuckoo, loony, loopy
"that was a really stupid thing to do"
antonyms: intelligent, sensible
•dazed and unable to think clearly.
"apprehension was numbing her brain and making her stupid"
synonyms: into a stupor, into a daze, into oblivion; stupefied, dazed, unconscious