The phrase "most attaining" refers to the highest level of success achieved in a particular field or area. Synonyms for "most attaining" could include terms like accomplished, successful, high-achieving, proficient, elite, or exceptional. These words all convey a sense of excellence and mastery, suggesting that the individual in question has reached the pinnacle of their chosen field or activity. Other possible synonyms might include words like renowned, celebrated, or distinguished, which emphasize the person's well-deserved reputation for greatness. Regardless of the specific synonym used, the term "most attaining" carries positive connotations and suggests a high level of respect and admiration for the individual in question.