Why was I so stupid as to agree to meet him for dinner?

He needn't have been caught, but he's very stupid for a boy of his age.

I'm not agreeing to be stupid for the rest of my life.

She wasn't stupid for a girl whose entire education had been in state schools.

I didn't agree with the war, and it would have been stupid for me to go into the army after two years.

And to keep them from thinking it, I made sure to act very stupid for some time thereafter.

He'd been stupid to think there was anything here for him.

"I think it's so stupid for the kids to continue to wear it."

Of course, he'd have to be particularly stupid for that to happen.

Well, never feel stupid for a question because it's something that concerns you.