The word "un-rightful" indicates something that is unjust or illegitimate. Its antonyms include rightful, legitimate, fair, just, and lawful. These words indicate that something is in accordance with the law or is morally and ethically acceptable. The opposite of "un-rightful" is a state where everything is in order and there is no violation of human rights or rules. When something is rightful, it means that it conforms to the laws and regulations, and it is morally and ethically correct. It is therefore imperative for individuals and societies to ensure that they uphold and maintain actions that are rightful and just, and refrain from engaging in illegal or unethical activities.