bone·head
 /ˈboʊnˌhɛd/  noun  ,  pl   -heads [  count  ]
   informal   : a stupid or foolish person
   I told him he was acting like a bonehead. [=numbskull]
  — often used before another noun
   a bonehead [=boneheaded] decision
  bone·head·ed /ˈboʊnˈhɛdəd/  adj   [more ~; most ~]
   a boneheaded mistake
  bone·head·ed·ness  noun   [  noncount  ]