The word "un-done" is often used to describe something that has not been completed or finished. Antonyms for this word would be words that describe something that has been completed or finished. Some antonyms for "un-done" could include words like "completed," "finished," "resolved," "settled," or "accomplished." These words all have a similar meaning in that they describe something that has been brought to a complete or satisfactory end. Antonyms for "un-done" can be useful in indicating the opposite of a situation where something has not been finished or completed, and can help to convey a sense of finality or closure.