The phrase "most world without end" is an idiomatic expression, meaning "forever" or "endlessly." Therefore, its antonyms would be "temporary," "brief," "limited," "finite," "restricted," and "restricted duration." These antonyms suggest a sense of impermanence and transience, which is the opposite of the perpetual nature of "most world without end." Other possible antonyms could include "mortal," "mortal life," and "mortal existence," referring to the finite nature of human life and the world. Overall, the antonyms of "most world without end" are words that suggest limitations and boundaries, as opposed to boundlessness and infinity.