In the book 'Pride and Prejudice' by Jane Austen, the character Mr. Darcy is often described as proud, but this pride is more nuanced than it initially appears. He believes in his own superiority due to his wealth and status. However, as the story unfolds, we see moments where his pride turns into hubris, leading him to make significant mistakes in his relationships. The term 'hubris' is used to signify excessive pride or self-confidence, especially in a way that results in misfortune.

Based on the context provided, what is the best synonym for the word 'hubris' as it is used in the excerpt?