The antonyms for "am one's duty to" are "not obliged to" or "free from obligation." When you are not duty-bound, you are not required to do something, and it is not your responsibility. Your decision to act or not is based on your own volition. These antonyms apply to situations like donating to charity, volunteering, or helping someone in need. While it is admirable to be socially responsible and help others, it is also acceptable to choose not to do so. It is also important to recognize that sometimes the obligation can be self-imposed, and it is okay to let go of it to prioritize your well-being.