softheaded

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