You great nitwit!
你这大笨蛋！
柯林斯例句
Would you stop doing those nitwit tricks?
你能停止玩你那些愚蠢的戏法 吗 ?
电影对白
You're a real nitwit. Why should you Badmouth his girlfriend in his face?
你真是个糊涂虫, 怎么能当他面说他女朋友的 呢 ?
互联网
Why did you do that, you nitwit?
你为什么要干那个 呢 ?你这个傻瓜.
《简明英汉词典》