The term art valid has no direct antonyms as it is not a commonly used phrase. However, if we separate the words, art and valid, and consider their individual meanings, we can come up with possible antonyms. The opposite of art, which refers to creativity and expression, could be mundanity or monotony. On the other hand, the opposite of valid, which means legally or logically sound, could be invalid or baseless. Therefore, some potential antonyms for art valid could be bland invalid, monotonous baseless or dull inconclusive. However, it is important to note that these pairings are not direct antonyms for the term art valid.