Sonntagsbeilage: Is that an extra part of a newspaper that comes every Sunday? For example, a special bit for music or tv? Or something different like " the newspapers on Sundays come with a receipt book " Is that it? --> Yes, exactly! Sonntagsbraten: Is that the dish that people only eat on Sundays because they can't afford to eat it in a regular basis? --> Close. It's not that you can't afford it. You use this word more likely for a dish that you eat on Sundays because it takes a long time (!) to make it. Sonntagsfahrer: Is that a bad driver that has no much experience? --> No. The point is he/she drives very slowly (!). Sonntagskleid or Sonntagsanzug: Is it one's best clothes that are used only on especial occasions like Church or something else? --> Yes! Sonntagsreden/er: As far as I understood, is that person that speechs about a better world but him/herself doesn't do anything to change. Just talk! Is that it? --> No. It means a person who do a speech about (f.e.) what everybody should do, and the next day he is going to do the opposite. Sonntagsspaziergang: That walk, that family does only on Sundays? --> Yes. Maybe longer than the ordinary walk. Sonntagszeitung; This one I could not understand properly. From what I read is a newspaper that is only released on Sundays? --> Yes! You understood this right. There is no other particular meaning in it.

In German you can add just about any two words together to make another word. the meaning is the simly the two words together. Example: Sonntagsbraten is a "Braten" that you eat on "Sunday". Sonntagsreden is a "reden" that happens on "Sonntags". There is really no special meaning attached to any of these, unless they occur in some kind of context.

yes but sometimes you add an s betweeen the two, sometimes you can't ...und Regel sind mir nicht klar.

Como yo lo veo se trata de una especie de genitivo sajón para unir palabras Sonntagsbeilage: suplemento dominical del diario, o diario do domingo traz uma revistinha em cor com alguns tema da atualidade. Sonntagsbraten: el asado dominical Sonntagskleid: la ropa del domingo ( domingo a gente se arruma mais,tipo paa ir na igreja...) Sonntagsreden : discurso dominical, imagino la homilía de la iglesia. Sonntagszeitung: el diario dominical, eu não sei no Brasil mas sim o diario nesse dia é mais gordo e traz mais coisas a ler

Your explanations are mostly right. Sonntagsreden/er: It's also a very formal speech with no real meaning. (But your definition was good) Sonntagszeitung; This is really a newspaper that is only released on Sundays! (Lika a weekly paper). Also some newspapers release a sunday version together to save money.