unreadable

Her expression is unreadable, at once thoughtful, curious, interested and detached.

Inside was a damp note that was almost unreadable.

That distinction would have to go to “Finnegans Wake,” a book that has been described as unreadable even by its most fervent admirers.

That unreliability mirrors, whether intentionally or not, that of one of his principal sources: the voluminous, virtually unreadable memoir that his great-grandfather composed.

Thought to be unreadable, they had been left untouched for decades.