Translations for expressive in French

Here are paragraphs from public domain books translated:

"American slang is very expressive sometimes. And what did your wife do when she finished speaking to her maid?"	— L’argot américain est très expressif parfois, et que fit votre femme quand elle eut fini de causer avec sa femme de chambre ?
The Adventures of Sherlock Holmes, by Arthur Conan Doyle	Les Aventures de Sherlock Holmes, de Arthur Conan Doyle