The phrase "most ratified" refers to the state of having been approved and agreed upon by the largest number of parties. Some synonyms for this term include "most approved," "most validated," "most authorized," and "most confirmed." Other options might include "most endorsed," "most supported," "most accepted," and "most backed." Depending on the context in which the word "most ratified" is being used, other synonyms could be appropriate as well. For example, if the focus is on a legal agreement, "most legal" or "most binding" might be suitable alternatives. Ultimately, the most effective synonym will depend on the specific usage and intended meaning of the phrase.