The term "un-ended" refers to a state of being that is without an end, perpetual, or indefinite. Antonyms to this word include "ended," "completed," "concluded," "finished," and "terminated." These are all words that signify a state of closure or finality. Other possible antonyms for "un-ended" could include "limited," "bounded," "restricted," and "time-bound," as these words suggest a specific point of termination. While "un-ended" might be useful in some contexts, such as to convey a sense of openness or possibility, antonyms may be better suited for situations where closure or definition is necessary.