When looking for antonyms for the word "more unambitious," there are several options to consider. One possible antonym could be "highly motivated," which suggests a strong desire for success and achieving one's goals. Another alternative could be "ambitious," which implies a willingness to take on challenges and strive for greater accomplishments. A third possibility might be "driven," which conveys a sense of determination and focus. Ultimately, the choice of antonym will depend on the context in which the word is being used and the specific meaning that one wishes to convey. Whatever antonym is chosen, it should serve to highlight the opposite of the original meaning of "more unambitious.