The phrase "fired up on" conveys enthusiasm, energy and excitement, but what are some antonyms for this expression? Some words that could be used to describe the opposite of "fired up on" include: disinterested, apathetic, lethargic, unenthusiastic, indifferent, and lackluster. These words depict a lack of passion, interest, or drive. Being "fired up on" is typically associated with positive energy, motivation, and zeal, while the antonyms suggest a lack of inspiration and vitality. It is essential to recognize when someone is not "fired up on" something, as it could be a sign of a more profound problem that needs to be addressed.