It was not in her nature to question the veracity of a young man of such amiable appearance as Wickham.
– Jane Austen
Pride and Prejudice, Chapter 17. Elizabeth is prejudiced against Darcy. So she believes George Wickham’s story that Darcy acted cruelly to him and refused to honor the wish of Darcy’s father that finance be provided for Wickham to become a clergyman. By emphasizing Wickham’s "amiable appearance," the narrator is hinting that he is not quite the person that Elizabeth believes. This foreshadows Wickham being outed later as a scoundrel and deceiver.