What’s another word for “unsmart?”

While watching Shane and David on the Upside Down Show on Noggin Mika yells in frustration

Mika: THEY’RE NOT SMART

Mommy: Why?

Mika: BECAUSE THEY’RE NOT DOING ANYTHING SMART!

In our home we don’t use the word “stupid.” I assume that this is how the conversation would have gone if she were familiar with word.

Mika: THEY’RE STUPID!

Mommy: Why?

Mika: BECAUSE EVERYTHING THEY’RE DOING IS STUPID!