unfilmable
/ʌnˈfɪlməbl
/adjective
(Especially of a novel) not able to be adapted into a film: the trilogy was once considered unfilmable...
- Gravity's Rainbow, for instance, is surely the most unfilmable of novels.
- His violent examination of the world of the 1980s was thought to be unfilmable.
- In 1995, this material - long considered unfilmable - was finally made into a movie of the same title, The Basketball Diaries.