The antonyms of "in-utility" are "useful," "beneficial," "helpful," "functional," and "valuable." These words represent the opposite meaning of in-utility, indicating that something has value or serves a purpose. A useful object is one that serves a beneficial function or fulfills a certain need. Similarly, a beneficial action has a positive effect or outcome. Therefore, in contrast to in-utility, which means uselessness or lack of value, the antonyms indicate that something has worth or effectiveness. By understanding these antonyms, we can identify the best course of action and make smarter decisions in various aspects of our lives.