Etymology
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indecipherable (adj.)

1802, from in- (1) "not" + decipherable (see decipher (v.)). Undecipherable is older. Related: Indecipherably; indecipherability.

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Definitions of indecipherable

indecipherable (adj.)
not easily deciphered;
indecipherable handwriting
indecipherable (adj.)
impossible to determine the meaning of;
an indecipherable message
From wordnet.princeton.edu