He seems to be completely stupid, and scores straight zeroes in school, making him a model student.

"It's a terrible admission because it makes me sound completely stupid, but I'd never noticed before that they were part of a series."

I might be an idiot, but I'm not completely stupid.

The main character is a completely stupid spy who always has bad luck.

"Were humans completely stupid before they had angels to teach them?"

So I guess this is the perfect time for a completely stupid and futile gesture.

I may not be too bright about some things, but I'm not completely stupid.

I'm not completely stupid, I've seen how it played out.

Grey felt completely stupid; he had walked right into that one!

I just realized that that's a completely stupid name for a blog!