The antonyms for the phrase "art worthless" include several positive factors that can be associated with art. When something is considered art, it can be anything from paintings, sculptures, and performances to literature, films, and music. If something is deemed art valuable, it means that it possesses qualities such as beauty, rarity, and craftsmanship. Art can also be significant in terms of historical or cultural influence, and it can hold sentimental or emotional value for collectors and enthusiasts. Additionally, art can be financially valuable, with many pieces being sold for millions of dollars at auctions. Therefore, "art worthless" can be replaced by terms such as "art valuable," "art significant," and "art priceless.