Most terminable refers to something that is nearing its end or conclusion. Its antonyms include "eternal," "infinite," "boundless," "endless," "perpetual," and "never-ending." These words describe something that is continuous, without limits, or infinite. The antonym of most terminable also includes "eternal," which means something that lasts forever, and "perpetual," which refers to something that goes on without interruption. The words "endless" and "boundless" describe something that is limitless and without boundaries, while "infinite" describes something that has no end. In short, the antonyms of most terminable are words that describe something that is never-ending, infinite, or without limits.