Translations for crazy in French

Here are paragraphs from public domain books translated:

I now felt sure that the poor fellow had gone crazy in his solitude, and I suppose I must have shown the feeling in my face, for he repeated the statement hotly:	Je ne doutai plus que le pauvre garçon fût devenu fou dans son isolement. Il est probable que mon visage exprima cette pensée, car il répéta son assertion avec véhémence :
Treasure Island, by Robert Louis Stevenson	L’Île au trésor, de Robert Louis Stevenson

I now felt sure that the poor fellow had gone crazy in his solitude, and I suppose I must have shown the feeling in my face, for he repeated the statement hotly:	Je ne doutai plus que le pauvre garçon fût devenu fou dans son isolement. Il est probable que mon visage exprima cette pensée, car il répéta son assertion avec véhémence :
Treasure Island, by Robert Louis Stevenson	L’Île au trésor, de Robert Louis Stevenson

"You are crazy," said Daspry. "Why, the major gave you only twenty thousand, and that was like money thrown into the sea, as the boat was a failure at the preliminary trials."	Daspry s’esclaffa. — Tu es fou. Le major ne t’en a donné que vingt mille. Vingt mille jetés à l’eau, puisque les essais ont manqué.
The Extraordinary Adventures of Arsene Lupin, Gentleman Burglar, by Maurice Leblanc	Arsène Lupin gentleman-cambrioleur, de Maurice Leblanc

"You are crazy," said Daspry. "Why, the major gave you only twenty thousand, and that was like money thrown into the sea, as the boat was a failure at the preliminary trials."	Daspry s’esclaffa. — Tu es fou. Le major ne t’en a donné que vingt mille. Vingt mille jetés à l’eau, puisque les essais ont manqué.
The Extraordinary Adventures of Arsene Lupin, Gentleman Burglar, by Maurice Leblanc	Arsène Lupin gentleman-cambrioleur, de Maurice Leblanc