Corroborated means confirmed or verified. Therefore, antonyms for the word "un-corroborated" would be related to ideas or information that have been confirmed or established as true. Some possible antonyms include validated, substantiated, supported, verified, confirmed, authenticated, proven, and established. These words all imply a sense of reliability and trustworthiness, indicating that the information or idea in question has been thoroughly tested and verified by reputable sources. In contrast, "un-corroborated" suggests doubt or uncertainty about the truthfulness of the idea or information being presented.