The phrase "art obliged" is often used to describe something that is mandatory, necessary, or required. When looking for antonyms for this phrase, we can explore words that suggest the opposite, like optional or voluntary. We could also use terms that describe a lack of obligation, such as unnecessary or unwarranted. Additionally, words like dispensable, inessential, or superfluous all convey a sense of something that is not required or obligatory. When we consider antonyms for "art obliged", we open up a range of language that describes various degrees of obligation, from mandatory to completely unnecessary.