1. Don't be such a thickhead, try to understand what I'm saying.
别那么愚蠢，试着理解我说的话。

2. He can be a real thickhead sometimes, refusing to listen to anyone else's opinion.
有时候他真是个愚蠢的人，拒绝听取他人的意见。

3. I can't believe you forgot the keys again, you're such a thickhead!
我简直无法相信你又忘了钥匙，你真是个笨蛋！

4. Stop acting like a thickhead and pay attention to what's going on around you.
别像个傻瓜一样，注意周围发生的事情。

5. It's no use trying to reason with that thickhead, he never listens to anyone.
跟那个笨蛋理论是没用的，他从不听别人的意见。

6. I can't believe I made such a thickhead mistake, I should have known better.
我真不敢相信自己犯了这么个愚蠢的错误，我应该知道得更好。