The antonyms for the word "most pumped up" could be calm, relaxed, subdued, or lethargic. These terms suggest a lack of excitement, energy, or enthusiasm, which is the opposite of being pumped up. When we are calm, we are not overly excited or stimulated, and we feel at ease. Similarly, when we are relaxed, we are free from tension, anxiousness, or stress. Subdued and lethargic suggest that we lack vigor, vitality, or motivation, and we may feel tired or listless. Therefore, depending on the context, the antonyms for "most pumped up" may vary, but they all convey a sense of low energy or subdued emotions.