1. He's so woodenheaded that he can't understand even the simplest instructions.
他是如此愚蠢，甚至连最简单的指令也无法理解。

2. Despite all the evidence, she remains woodenheaded and refuses to admit she's wrong.
尽管有很多证据，她仍然固执己见，拒绝承认自己的错误。