able to think quickly Antonyms

softheaded bonkers barmy around the bend wooden witless vacuous touched thick slow simple-minded loopy nuts round the bend schizophrenic unintelligent certifiable screwball moronic wooden-headed thickheaded boneheaded potty dopey obtuse moonstruck deranged demented delusional daft cretinous crazed clownish chuckleheaded brainsick brainless dim doltish dozy mental imbecile ignorant idiotic half-witted foolish feeble-minded eccentric dumb dull-witted bovine