The antonyms for the word "more bubbleheaded" are "sensible," "intelligent," "bright," and "astute." These words describe individuals who have a sharp mind, make sound decisions, and have the ability to solve complex problems. They possess a high degree of knowledge and understanding, which enables them to excel in their personal and professional lives. On the other hand, individuals who are more bubbleheaded are often seen as lacking intelligence, being unable to think critically, and overly focusing on superficial or unimportant aspects of life. It's essential to improve our cognitive abilities to make better decisions and achieve success in our endeavors.