The antonyms for "most undexterous" are quite numerous, and they all share a common theme: physical agility and gracefulness. Some examples include "nimble," "dexterous," "coordinated," "skillful," "graceful," "agile," and "fluid." These words describe someone who is adept at moving their body and manipulating objects with precision and control. Not only are they able to perform a wide range of physical activities, but they do so with ease and finesse. Unlike someone who is "most undexterous," these individuals are confident and graceful in their movements, and they inspire admiration and respect from others who witness their agility in action.