undeciphered

adjective
un·​de·​ci·​phered | \ ˌən-dē-ˈsī-fərd How to pronounce undeciphered (audio) \

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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The first known use of undeciphered was circa 1668

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