Uncorroborated (adjective)

1. Not corroborated; not confirmed or supported by other evidence.
2. Not having been confirmed or supported by other evidence; not having been verified.

Origin:

Late 18th century: from un-1 + corroborated, on the pattern of words such as unverified.

Examples:

1. The police had to release the suspect because the evidence against him was uncorroborated.
2. The witness's testimony was uncorroborated and therefore not considered reliable.
3. The scientist's theories were considered controversial because they were based on uncorroborated data.
4. The rumors of the company's financial troubles were uncorroborated and could not be confirmed.
5. The allegations of misconduct were taken seriously, but were ultimately determined to be uncorroborated.