STUPID/NOT INTELLIGENTnot good at understanding things 头脑迟钝的,笨的SYN stupid
Examples from the Corpus
slow-witted• No doubt such people must have seemed slow-witted.• His misery made him slow-witted and careless and he was ashamed of the part he had played at the warren.• He had a reputation for being a bit slow-witted but it didn't perturb him in the least.