From Longman Dictionary of Contemporary Englishunreadun‧read /ˌʌnˈred◂/ adjective unread books, papers etc have not been read
Examples from the Corpus
unread• A large proportion of the books were most probably unread.• Both subscriptions cost about £800 per year and both have the nasty habit of being so voluminous as to go largely unread.• There was a pile of unread mail on his desk.• In fact, I would not have disturbed those unread pages for the world.• Paul sat down and began to make his way through the pile of unread papers on the table.• He was a tourist peering over a painter's shoulder as he scanned my unread stack of books.• Often they will be left totally unread, unless and until a dispute arises. 