The antonyms for "most beginning" are "furthest end," "last," and "final." These words denote the end or conclusion of something, in contrast to the beginning. "Furthest end" and "final" suggest the absolute end of a process or journey, while "last" emphasizes the temporal aspect of an event. Other antonyms for "most beginning" could include "midpoint," "intermediate," or "middle," which describe a point in between the beginning and end of something. It's important to understand antonyms because they help us to better understand the full spectrum of meaning and nuances of a word, allowing us to communicate more effectively.