The term "most grayhaired" refers to people who have a significant amount of gray or white hair. Antonyms for this term could include "young," "juvenile," "energetic," "vibrant," "lively," "colorful," "fresh," "animated," "youthful," "sprightly," "peppy," "full of life," "active," and "spirited." These antonyms all have a positive connotation and suggest qualities that are often associated with youth, energy, and vitality. They provide a sharp contrast to the more subdued and aging qualities associated with gray hair, highlighting the differences between youth and old age.