The antonyms for the word "most duty bound" may include "carefree," "relaxed," "casual," "uncommitted," and "indifferent." These words portray a lack of responsibility or commitment, which is the opposite of being duty-bound. When someone is described as duty-bound, it suggests that they take their responsibilities seriously and are committed to fulfilling their obligations. In contrast, someone who is carefree or relaxed may not have any particular obligations or may not feel any particular pressure to fulfill them. Using antonyms can help to provide context and contrast, allowing a clearer understanding of the original term's meaning.