"profound book" is a correct and usable phrase in written English.
It is typically used to describe a book that is full of deep, meaningful ideas and insights. Example: "I highly recommend this profound book on philosophy; it will challenge your thinking and open your mind to new perspectives."
"It is an extremely profound book for someone so young.
And what does this "most profound book" recommend?
Still, one feels there's a larger, more profound book poking through this one at odd moments.
"Wuthering Heights is a strange, dark and profound book and I wanted to honour that spirit.
I imagined it as a gloomy, socially critical, profound book about Russianness, expansive as the steppes.
A profound book read in adolescence reverberates in ways that no one can begin to compass.
These are profound books, about a deep relationship and about the deeply spiritual questions which confront us in society".
One of the most thoughtful and, in spite of the author's excessive self-assurance, most profound books on Asia is Das Reisetagebuch eines Philosophen (1919; Travel Diary of a Philosopher), by the German thinker Hermann Keyserling (1880 1946).
An amazing erudite and yet highly readable account of why and how information plays such a central role in all our lives, Gleick's The Information is amongst the most profound books written about technology over the last few years.
The invitation came from a professor who calls "Ido in Autismland" one of the most profound books he's read.
With its wacky equations ("Key times winding equals go"; "Pond minus dam equals mud"; "Dog divided by how must equal why"), its blaring headlines with ironic import, and equal amounts of mischief and melancholy, it is a profound little book – the equal, in some ways, to the Alice books.
