undeciphered

adjective un·de·ci·phered \ ˌən-dē-ˈsī-fərd \

Definition of undeciphered

: not deciphered
  • … clay tablets inscribed with the curious, and then undeciphered, cuneiform ("wedge-shaped") script …
  • —Timothy Potts

First Known Use of undeciphered

circa 1668

in the meaning defined above

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