knucklehead synonyms

airhead birdbrain blockhead bonehead clot cluck clunk cretin cuddy deadhead dimwit dip dodo dolt donkey doofus dope dork dullard dumbbell dummy dunce dunderhead fathead gander golem goof goon half-wit hammerhead ignoramus imbecile jackass idiot loggerhead loon lump lunkhead moron mug mutt natural nimrod nincompoop ninny nit nitwit noodle numskull oaf pinhead prat saphead schnook simpleton stock stupe stupid thickhead turkey yahoo yo-yo