The word "un done" refers to something that has not been completed or finished. Its antonyms would be words that convey the opposite meaning, such as done, finished, completed, achieved, accomplished, concluded, fulfilled, or made. These words signify the sense of something being resolved, completed, or finished with success. For instance, when we use the word done, we imply that a task has been completed, while finished is often used to indicate that something has come to an end. Using the right antonym of "un done" in a sentence can help convey the intended meaning and provide clarity to the communication.