The antonyms of "un-questioned" are "questioned", "doubted", or "challenged". These words suggest that a certain level of scrutiny or skepticism has been applied to the original statement or claim. If something is questioned, it means that its validity or accuracy is being examined, and there is some uncertainty around its truthfulness. Similarly, if something is doubted, then there is a lack of confidence or trust in its authenticity. Finally, if something is challenged, it has been put up for debate or contestation, and its original meaning or interpretation may be in question. These antonyms highlight the importance of critical thinking and analysis in assessing information and ideas.