The concept of "more nonpareil" can be a bit tricky when it comes to identifying antonyms. Nonpareil means "unmatched" or "unrivaled," so its antonyms would be words that convey the opposite idea. Some antonyms for nonpareil could be "average," "mediocre," or "ordinary." Other antonyms may include "inferior," "subpar," or "substandard." In general, any word that suggests a lower level of excellence or uniqueness could be considered an antonym for nonpareil. However, it should be noted that nonpareil is a particularly strong word, so finding an exact antonym that conveys the same level of intensity may be difficult.