indecipherable
Definitions
Impossible to read or interpret.
Not capable of being understood or deciphered.
Examples
The ancient manuscript was written in an indecipherable code that baffled the world's greatest cryptographers.
His handwriting was so messy that his grocery list was completely indecipherable to everyone but himself.
The muffled message over the radio was indecipherable due to the heavy static during the storm.
Synonyms
unreadable illegible inscrutable cryptic enigmatic obscure unintelligible
Antonyms
readable legible clear intelligible understandable comprehensible plain