"Yet to be decided" refers to a situation that is uncertain, undecided, or unresolved. Antonyms for this phrase include terms that imply decisiveness, certainty, and finality. Some of the antonyms for "yet to be decided" are "concluded," "decided," "resolved," "settled," "definite," "determined," "fixed," "finished," "completed," "accomplished," and "established." These words indicate that a decision has been made, and there is no longer any uncertainty or doubt about the matter. Using antonyms can lend a sense of clarity and authority to a statement, highlighting the importance of making informed decisions and taking definitive actions.