The word "art uptight" is usually used to describe someone who rigidly adheres to traditional or formal artistic norms, and may be resistant to experimentation or innovation. Antonyms for "art uptight" might include terms such as "avant-garde," "bohemian," or "adventurous," which suggest an openness to new ideas and a willingness to take creative risks. Other antonyms might include words like "relaxed," "casual," or "informal," which imply a less rigid approach to artistic expression. Ultimately, the antonyms for "art uptight" all point towards a more free-spirited, imaginative, and improvisational mode of artistic expression.