thick-headed

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌthick-ˈheaded adjective informal  STUPID/NOT INTELLIGENTextremely stupid 极其愚蠢的 He’s so thick-headed he can’t understand simple instructions. 他笨极了，连简单的指令都理解不了。

Examples from the Corpus

thick-headed• In the morning I awoke, thick-headed and a prisoner.• Who could have seen through such thick-headed nonsense?• I got up, thick-headed, with a cloying mouth.• He was stiff with mud and thick-headed with tiredness as he and Isay trooped back through the gatehouse to the Manse.

ˌthick-ˈheaded adjectiveChineseSyllable  

extremely stupid Corpus

thick-headed
ˌthick-ˈheaded adjective informal
extremely stupid:
    He’s so thick-headed he can’t understand simple instructions.