v. Simple past tense and past participle of unbook.
the GNU version of the Collaborative International Dictionary of English
adj. Not written in a book; unrecorded.
The Century Dictionary and Cyclopedia
Unbookish.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. not reserved in advance
Word Usage
"This is the debt, yet unbooked, which is composed of the provisional claims of the creditors of the emigrants, the contractors, and various other holders of claims on the government."