More unevolved could mean lacking in development, progress or advancement. Its antonyms would therefore mean the opposite - highly developed, advanced, progressive, and sophisticated. Additionally, words such as evolved, refined, cultivated, and improved could be used as antonyms for "more unevolved." For example, if a society is highly evolved, then it would be considered advanced in terms of culture, science, and technology. In contrast, if a society is more unevolved, then it may be struggling to keep up with the changing times. Therefore, it is important to strive for progress and to seek out knowledge and growth to avoid being stagnant and unevolved.