Synonym of imbecilic

foolish absurd asinine brainless cockamamie crazy daffy daft dippy doltish dotty fantastic fatuous feebleminded half-baked half-witted harebrained idiotic ill-advised ill-considered imprudent incautious indiscreet injudicious insane irrational jerky kooky loony ludicrous lunatic mad moronic nerdy nonsensical nutty preposterous ridiculous senseless short-sighted silly simple softheaded stupid tomfool unearthly unintelligent unreasonable unwise wacky weak witless zany