He really wanted to go to the party last night, and he can't believe he made such a stupid mistake!

他昨晚真的很想去参加聚会，他不敢相信他犯了这么愚蠢的错误！

youdao

Do you really think he would be that stupid?

你果真认为他那么蠢吗？

《柯林斯英汉双解大词典》

Did people really think he was that stupid?

难道大家真以为他那么蠢吗？

youdao

But, you see, nobody knew the secret of how stupid he really was.

VOA: special.2009.01.03

But,you see,nobody knew the secret of how stupid he really was.

VOA: special.2010.03.27

Talking to Ira is really interesting because he tries to refrain from saying things that are stupid or a waste of time.

WSJ: The Blogger and the Radio Star | Partnership

"The only really stupid thing I ever did in my life was to start smoking, " he said in 1996.

BBC: US Quincy star Jack Klugman dies at 90