>>212919318I disagree. "Unadaptable" means more than just "you would lose a lot". There are many good books which would lose more.
You would need to do it as a TV series or perhaps a trilogy of movies, to get a decent proportion of the stuff in. OK, that's been done. Not great but it's a starting-point.
You probably want occasional voice-over as well, to get some of the essential interiority. Not too much, or you're just doing an audiobook with accompanying pictures. But that's OK. No-one complains about the voice-over in Goodfellas, etc.
tl;dr It's been done, and it could be done better.