The phrase "most unbaked" suggests that something is not fully developed or matured. Antonyms for this phrase could include "fully baked," "complete," "mature," or "ripe." These terms imply that whatever is being referred to has reached its full potential or has been thoroughly formulated. Additionally, the word "unstable" could be an antonym for "most unbaked," indicating that something is not strong or secure enough to be successful. Conversely, "stable" or "secure" could be other antonyms, which suggest stability and strength. Ultimately, the appropriate antonym for "most unbaked" will depend on the context in which it is used.