In-essentialities refer to things that are not necessary or important. The antonyms of in-essentialities include indispensable, essential, vital, important, imperative, and necessary. These words describe things that are necessary, relevant, essential, and indispensable. For instance, to accomplish a task successfully, it is indispensable to have the necessary skills, knowledge and resources. Also, a vital aspect of any business is to have efficient communication with clients, employees, and stakeholders. It is essential to prioritize important tasks and complete them on time. Overall, the antonyms of in-essentialities highlight the importance of recognizing what is vital and necessary to achieve success and accomplish goals.