Whooped up is a colloquial term that means excited or enthusiastic. The antonyms for whooped up are calm, quiet, and subdued. When someone is calm, they are not easily excited or agitated. They remain composed and collected in stressful situations. When someone is quiet, they prefer to remain silent and not make any noise. They avoid disorder and chaos. When someone is subdued, they are no longer lively or energetic. They have lost their enthusiasm and spirit, and they behave in a somber and serious manner. So, in contrast to being whooped up, the antonyms calm, quiet, and subdued suggest a much more restrained and controlled demeanor.