The word "art undetermined" refers to a piece of art that lacks clarity or purpose. Antonyms for this phrase include "art definite," which refers to a piece of artwork that has a clear and defined purpose, such as a commissioned portrait or a mural with a specific theme. Another antonym is "art intentional," which describes a piece of art that has been created with a specific intention or message in mind. "Art decided" is another antonym, indicating a piece of art that has been finalized and has a clear direction or style. Additionally, "art established" would be an antonym, meaning a piece of art that has a proven track record and a strong reputation within the artistic community.