The antonyms for the word "more gray-haired" are words that describe the opposite of gray hair or an increase in gray hair. The antonyms can be vibrant, colorful, lively, youthful, or energetic, depending on the context. In many cases, an increase in gray hair is associated with aging, so the antonyms may refer to a more youthful appearance or a more lively energy. Words like "vibrant" or "colorful" can suggest energy, while "youthful" or "energetic" may suggest a more youthful appearance. Thus, people who want to avoid the increasing gray hair might look to these antonyms for possible solutions.