This is the 13612th most frequent Russian word.
недоступны
Unavailable.
The word 'недоступны' describes a state where certain features cannot currently be used.
Из-за технических проблем на сайте некоторые функции временно недоступны.
Due to technical issues on the website, certain features are temporarily unavailable.
Here, 'недоступны' means that the books are not easily obtainable or available to many individuals.
Эти книги редкие, и они недоступны для широкого круга читателей.
These books are rare, and they are not accessible to a broad range of readers.
This use of 'недоступны' highlights a physical inaccessibility relating to the structure of the building.