When it comes to antonyms for the term "most gray-haired," there are several options to consider. One antonym could be "young," as gray hair typically signifies aging. Another antonym could be "colorful," as gray is often seen as a dull or drab color. Additionally, "dyed" could be considered an antonym, as it refers to the act of coloring or masking gray hair. Some other potential antonyms for "most gray-haired" could include "youthful," "vibrant," "lively," or "bright-eyed." Ultimately, the antonym will depend on the context in which the term is being used and what qualities are being contrasted.