The phrase "most cooked-up" can mean something that is fabricated or invented. Antonyms for this phrase could include genuine, authentic, real, or true. When something is genuine or authentic, it is considered to be true, valid, or accurate. It is not invented or made up. In contrast, something that is most cooked-up is not genuine or authentic. The phrase "most cooked-up" suggests that something has been concocted or fabricated, usually in an effort to deceive or mislead others. Therefore, antonyms like genuine or authentic can serve to emphasize the legitimacy and veracity of something.