unreadableness

unreadable +‎ -ness

unreadableness (uncountable)

1. The quality or state of being unreadable.
   • 2010, Katharine Breen, Imagining an English Reading Public, 1150-1400, page 109:

     The text, surviving as a “workshop draft” consisting of “a hodgepodge of scraped out letters, belated additions and cancelled passages,” is known for its idiosyncratic orthography and its unreadableness.

• illegibility, indecipherability, inscrutability, unreadability

• decipherability, legibility, readability, readableness, scrutability