unreadable

adj

1. Not written clearly enough to be deciphered.

   “unreadable handwriting”

   “unreadable charts”

   “a machine that cut up secret documents into small unreadable fragments”

   “Although the kyūjitai kanji were not banned, the obsolete kyūjitai kanji have become unreadable to more and more readers over time, thus making texts including them difficult for modern readers, but at least there is a recognized mapping from new form to old form.”

2. Making an unpleasant reading experience, e.g. because it is dull or upsetting.

   “an unreadable book”

   “unreadable rants”

3. Not able to be accessed or played by some technical device.

   “The scratched CD is unreadable.”