Unendorsed is a word that describes something without any official approval or authorization. There are several synonyms for unendorsed that can be used to convey the same meaning. One such synonym is unapproved, which suggests that something has not been given the green light or permission to proceed. Another alternative is unauthorized, which implies that something is not allowed or sanctioned. Untested is another synonym for unendorsed that suggests that something has not been tried or evaluated for effectiveness or safety. Lastly, unendorsed can be substituted with disapproved, which indicates that something has been rejected or deemed unsatisfactory.