What type of reaction did the man express towards the book?

The man's expression towards the book suggests that he found it boring. This indicates a lack of engagement or interest in the material. When someone describes a book as boring, it often means that the content did not capture their attention, failed to stimulate their curiosity, or lacked excitement. This reaction can stem from various factors, such as predictable plotlines, uninteresting characters, or an overall style that fails to resonate with the reader. Understanding this helps frame how readers can interact with literature and the different emotional responses a book can evoke.