What is the author's style in Hunger by Knut Hamsun?

Words are the foundations of lies and deception throughout the story. Characters promise to pay each other back. The narrator both promises money to those he's in debt to and is in turn promised money by those he's lent to. He deceives the cab driver by making up a person he's looking for, and he lies needlessly to an old man who sits down next to him on a park bench. He creates an illusion that he has money and covers his shame by lying to clerks, policemen, friends, and nearly everyone he meets.