bone·head 
/ˈboʊnˌhɛd/ noun
plural bone·heads /ˈboʊnˌhɛd/ noun [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
▪ I told him he was acting like a bonehead. [=numbskull] — often used before another noun ▪ a bonehead [=boneheaded] decision
— bone·head·ed /ˈboʊnˈhɛdəd/ adjective [more boneheaded; most boneheaded]
▪ a boneheaded mistake
/ˈboʊnˈhɛdəd/ adjective [more boneheaded; most boneheaded] ▪ a boneheaded mistake
— bone·head·ed·ness noun [noncount]
