Translations for earnest in French

Here are paragraphs from public domain books translated:

Silver was a changed man, once he was out there and had his back to his friends and the block-house; his cheeks seemed to have fallen in, his voice trembled; never was a soul more dead in earnest.	Une fois là dehors et le dos tourné à ses amis et au blockhaus, Silver était un homme tout nouveau ; ses joues semblaient creuses et sa voix tremblait ; il parlait avec un sérieux absolu.
Treasure Island, by Robert Louis Stevenson	L’Île au trésor, de Robert Louis Stevenson

Silver was a changed man, once he was out there and had his back to his friends and the block-house; his cheeks seemed to have fallen in, his voice trembled; never was a soul more dead in earnest.	Une fois là dehors et le dos tourné à ses amis et au blockhaus, Silver était un homme tout nouveau ; ses joues semblaient creuses et sa voix tremblait ; il parlait avec un sérieux absolu.
Treasure Island, by Robert Louis Stevenson	L’Île au trésor, de Robert Louis Stevenson