Translations for treachery in French

Here are paragraphs from public domain books translated:

Silver, I should say, was allowed his entire liberty, and, in spite of daily rebuffs, seemed to regard himself once more as quite a privileged and friendly dependent. Indeed, it was remarkable how well he bore these slights, and with what unwearying politeness he kept at trying to ingratiate himself with all. Yet, I think, none treated him better than a dog, unless it was Ben Gunn, who was still terribly afraid of his old quartermaster, or myself, who had really something to thank him for; although for that matter, I suppose, I had reason to think even worse of him than anybody else, for I had seen him meditating a fresh treachery upon the plateau. Accordingly, it was pretty gruffly that the doctor answered him.

Silver, je dois le dire, jouissait d’une entière liberté, et quoiqu’on le rabrouât chaque jour, semblait se considérer de nouveau tout à fait comme un subalterne favorisé de privilèges et d’égards. Je m’étonnais de le voir supporter si bien ces mépris et s’efforcer avec son inlassable politesse de rentrer en grâce auprès de tous. Mais personne ne le traitait guère mieux qu’un chien ; sauf peut-être Ben Gunn, qui gardait toujours une peur affreuse de son ancien quartier-maître, ou encore moi-même, qui avais envers lui de réels motifs de gratitude, bien que sur ce point j’eusse des raisons de penser de lui plus de mal que n’importe qui, après l’avoir vu sur le plateau méditer une nouvelle traîtrise. En conséquence, ce fut d’un ton fort bourru, que le docteur lui répliqua :

Treasure Island, by Robert Louis Stevenson

L’Île au trésor, de Robert Louis Stevenson