Most nonpareil is a term used to describe something that is unparalleled or unmatched in its excellence, uniqueness or quality. Antonyms for this phrase could include words like inferior, ordinary, subpar, average or mediocre. These words suggest a lack of distinction or uncommonness in a particular object or person. In contrast to being most nonpareil, these antonyms indicate that something is of a lesser degree or is similar to other things in its category. While most nonpareil is an admirable trait to possess, it is important to recognize that things of lesser distinction still have value and purpose in their own right.