indecipherable

/ˌɪndɪˈsaɪfərəbəl/
adjective
  1. Impossible to read or understand because it is not clear, messy, or in code.
    • The doctor's handwriting was completely indecipherable.
    • His note was written in such a hurry that it was indecipherable.
    • The ancient inscription was so worn that it became indecipherable.
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