The antonyms for the word "fagged out" are refreshed, rejuvenated, energized, lively, and invigorated. These words describe how a person who is not fagged out feels. Rejuvenated means to feel fresh, healthy, and full of energy after a good night's sleep. Refreshed means to feel cool, calm, and collected after taking a break or a rest. Energized means to feel full of vitality and enthusiasm to tackle any challenge that comes your way. Lively means to feel active, dynamic, and full of life. Invigorated means to feel revitalized, recharged, and enthusiastic about life. These words are the opposite of fagged out, which means to feel tired, weary, and exhausted.