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-headednonsense?• 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.