Where was loneliness shown in Catcher in the Rye?

Loneliness manifests in Holden Caulfield's disconnect from others, as he struggles with his relationships and feels isolated from those around him. His constant search for connection and understanding highlights the theme of loneliness throughout the novel. Additionally, Holden's inner turmoil and inability to relate to the superficiality of the adult world deepen his feeling of solitude.