A "knothead" is a term that can be used to describe someone who has a 🌳 wooden head or a stubborn mindset, often resistant to change or new ideas. Their thinking may be rigid and inflexible, like a solid block of wood. However, despite this rigidity, their brain 🧠 is still functional and capable of processing information, albeit in a fixed manner. It's as if their mind is held together by 🔩 screws, tightly securing their thoughts and beliefs.