The antonyms for the phrase "most half-done" are "completely finished" or "fully done". When things are considered "most half-done", they are partially completed, and there is still work that needs to be done. However, if something is "completely finished", it means that all the work has been done, and there are no more tasks left to accomplish. Using antonyms that represent opposite meanings can help to clearly communicate ideas and concepts, making it easier for others to understand what is being said. By using these antonyms, we can convey a sense of completion and achievement, which can help us be more productive and focused.