The antonyms for the phrase "more unconfirmed" are "certain," "proven," "confirmed," or "verified." When something is confirmed, it means there has been enough evidence to indicate that it is true. It is the opposite of something that is unconfirmed, which means that it has not been proved or proven to be true or false. By contrast, when something is proven, it means that it has been established beyond doubt by evidence, while unconfirmed implies only that the truth has not yet been firmly established. Therefore, using the antonyms of "more unconfirmed" can indicate that something is certain, guaranteed, or proven to be true.