The Collaborative International Dictionary
Unbooked
Unbooked \Un*booked"\, a.
Not written in a book; unrecorded. ``UnbookedEnglish life.''
--Masson.
Wiktionary
unbooked
Not booked. v
(en-past of: unbook)
WordNet
unbooked
adj. not reserved in advance
Usage examples of "unbooked".
He sat at his desk, intending to put the finishing touches on his yearly Christmas sermon and then - on this blessedly unbooked Thursday evening - he was going to get to sleep before midnight.