"I've never seen anything wrong and I'm not a stupid person."

It's easy to sort it out with a stupid person or a beast.

"You know, a stupid person who doesn't understand any thing."

Well it's just a stupid person who can't drive properly.

Some Americans used it the sense of a stupid or worthless person.

A stupid person or someone with no mental abilities whatever.

The manager of the store was soon on the phone shouting about what some stupid person had done.

I heard it said that he was a stupid person's idea of what a smart person looks like.

Then, as a last resort, he asked them how a stupid person would do this task.

"In a long life, even a stupid person learns a few things."