There are several synonyms for the word "most self-confessed," which means the person who is the most open and honest about their faults or flaws. Some of the synonyms for this phrase include "most self-aware," "most honest about their limitations," and "most candid about their weaknesses." Other options include "most self-deprecating," "most frank about their shortcomings," and "most transparent about their vulnerabilities." Regardless of which word you choose to use, the overall meaning remains the same; the person in question is not afraid to admit their imperfections and strives to be truthful and authentic in all areas of their life.