Englishfeebleminded
adjective
don't be so feebleminded:
stupid, idiotic, moronic, imbecilic, foolish, half-baked, halfwitted, dimwitted, witless, dunce-like, doltish, cretinous, empty-headed, vacuous, vapid;
informal dumb, dim, dopey, dozy, birdbrained, peabrained, fat-headed, lamebrained, chuckleheaded, dunderheaded, wooden-headed, muttonheaded, boneheaded, crazy, mental, nuts, nutty, cracked, cuckoo, bonkers, dippy;
British, informal daft, potty, barmy, batty, dotty, crackers;
North American, informal dumb-ass.
▷antonyms clever.