Oh, Conseil put in, there are some people so unintelligent by nature . . .

呵！康，真有那么不聪明人！

Perhaps we're not designed to live together with one-another, no matter how intelligent or unintelligent you may be.

或许们生下来就不是为了和别人生活在一起，不管你智力如何。

There's an expression in English 'as thick as two short planks' which is a negative term for someone who's really unintelligent.

'as thick as two short planks'，这是一种贬义词，形容某人不太聪明。

" Luna has told me all about you, young lady, " said Xenophilius. " You are, I gather, not unintelligent, but painfully limited. Narrow. Close-minded."

“卢娜跟你，孩子”，谢农费里厄斯，“在看来，你并非智力超群，相反，思路很狭窄、很封闭。”