Empty
Empty adjective - Lacking contents that could or should be present.
Not booked and empty are semantically related. In some cases you can use "Not booked" instead an adjective "Empty".
Not booked
Empty and not booked are semantically related. You can use "Empty" instead an adjective phrase "Not booked".
Mutual synonyms
Cite this Source
Not booked and Empty. (2016). Retrieved 2026, July 31, from https://thesaurus.plus/related/empty/not_booked
Empty & Not booked. N.p., 2016. Web. 31 Jul. 2026. <https://thesaurus.plus/related/empty/not_booked>.
Not booked or Empty. 2016. Accessed July 31, 2026. https://thesaurus.plus/related/empty/not_booked.
Google Ngram Viewer shows how "empty" and "not booked" have occurred on timeline