Use "dunderhead" in a sentence

1. Dunderhead: Cody, why does the bible verse, ‘Revelation 7

2. Dunderhead: That’s too complicated for my small mind to bear

3. “Yeah, we relied on the memory of this dunderhead

4. “If you have doubts, someone should beat your head with a heavy hammer so that you understand that you’re a dunderhead

5. She wasn’t a complete dunderhead when it came to swords

6. You stupid old dunderhead