unopened

The folded edges of the signatures have not been cut open for reading. The book has been left in the beginning stages of its binding process or it was issued in this manner.
Found on http://www.alibris.com/glossary/glossary-books

unopened

[adj] - not yet opened or unsealed
Found on http://www.webdictionary.co.uk/definition.php?query=unopened

unopened

adjective not yet opened or unsealed; `unopened Christmas presents`
Found on https://www.encyclo.co.uk/local/20974
No exact match found