Antonyms for the phrase "more second to none" would include "average," "mediocre," "ordinary," "unremarkable," and "inferior." These words express the opposite meaning of the original phrase, which refers to something that is excellent, unparalleled, and unmatched. When we say that something is "more second to none," we are emphasizing its superiority and excellence. However, when we use antonyms to describe something as average or ordinary, we are emphasizing its mediocrity and lack of distinction. In many contexts, the use of antonyms can help us better understand the scope and range of concepts we are describing.