The antonyms for the word "most burnt-out" could include phrases like "refreshed and revitalized," "fully energized," "rejuvenated and restored," "full of vigor," or "ambitious and motivated." These words convey a sense of enthusiasm, inspiration, and vitality that is lacking in someone who is burnt-out. They reflect a person who is ready to take on new challenges and tackle their responsibilities with renewed vigor. Additionally, some other antonyms for "burnt-out" include "lively," "animated," "enthusiastic," or "refreshed." These words suggest qualities of liveliness or excitement, indicating a person is full of energy, passion, and vigor.