unattested

/ˌʌnəˈtɛstɪd/
adjective
  1. Not proven or supported by evidence or official records.
    • The historian dismissed the story as unattested by any reliable source.
    • Many claims about the ancient king remain unattested in archaeological findings.
    • The lawyer argued that the witness's statement was unattested and therefore unreliable.
What does "unattested" mean? | whatsthatwordmean | whatsthatwordmean