The term "more fatheaded" refers to someone who is foolish or silly. The antonyms of this word can be smart, intelligent, wise, and sensible. A person who is wise is knowledgeable and experienced, while a smart person has the ability to think quickly and effectively solve problems. Intelligent people possess a high level of academic or mental ability, whereas sensible individuals have good judgment and are practical. Therefore, using antonyms for the term "more fatheaded" can describe a person who is intelligent, smart, wise, or sensible, and exhibits excellent judgment, knowledge, and experience.