stupid
/ˈstjuːpɪd/
adjective
adjective: stupid; comparative adjective: stupider; superlative adjective: stupidest
1.
having or showing a great lack of intelligence or common sense.
"I was stupid enough to think she was perfect"
synonyms:
unintelligent, ignorant, dense, brainless, mindless, foolish, dull-witted, dull, slow-witted, witless, slow, dunce-like, simple-minded, empty-headed, vacuous, vapid, half-witted, idiotic, moronic, imbecilic, imbecile, obtuse, doltish; More
gullible, naive;
informalthick, thick as two short planks, dim, dumb, dopey, dozy, crazy, barmy, cretinous, birdbrained, pea-brained, pig-ignorant, bovine, slow on the uptake, soft in the head, brain-dead, boneheaded, lamebrained, thickheaded, chuckleheaded, dunderheaded, wooden, wooden-headed, fat-headed, muttonheaded;
informaldaft, not the full shilling;
vulgar slangdumb-ass
"they're not as stupid as they look"