The phrase "art a match for" often implies that someone or something is capable of matching or surpassing another's abilities or talents. Antonyms to this phrase would include "inferior," "unmatched," "outmatched," "inadequate," "subpar," and "unequal." These words convey the opposite meaning of the original phrase, indicating that the subject in question is not capable of matching or exceeding the abilities of another. While the original phrase is typically used in a positive context, the antonyms suggest that the subject is lacking in some way, and may have difficulty competing or succeeding against others.