Translations for obstinacy in French

Here are paragraphs from public domain books translated:

As I was afraid of some new fit of obstinacy, which my amour propre might have sustained somewhat better than my purse, I wrote down my name, had the book put on one side, and went out. I must have given considerable food for reflection to the witnesses of this scene, who would no doubt ask themselves what my purpose could have been in paying a hundred francs for a book which I could have had anywhere for ten, or, at the outside, fifteen.

Comme je redoutais un nouvel entêtement que mon amour-propre eût peut-être soutenu, mais dont ma bourse se fût certainement trouvée très mal, je fis inscrire mon nom, mettre de côté le volume, et je descendis. Je dus donner beaucoup à penser aux gens qui, témoins de cette scène, se demandèrent sans doute dans quel but j'étais venu payer cent francs un livre que je pouvais avoir partout pour dix ou quinze francs au plus.

The Lady with the Camellias, by Alexandre Dumas son

La Dame aux Camélias, de Alexandre Dumas fils