The word "more uncorroborated" suggests that something is not supported by evidence or proof. Its antonyms would indicate that a statement or claim is backed up with evidence or verification. The antonyms of "more uncorroborated" include words such as confirmed, substantiated, validated, corroborated, verified, and proven. A statement that is confirmed has been proven to be true, while one that is substantiated is supported by evidence. When something is validated, it is found to be accurate, and when it is corroborated, there is independent evidence to support it. Verified means that something is true and accurate, while when something is proven, there is conclusive evidence to support it.