Hello in Romansh...Bun Di, but I'm not sure about goodbye?
the formal way to say it is: A revair, Bun ans vair
bun di
"Hi!" in English is Sali! or Salut! in French, Hallo! or Tschau! in German, Ciao! in Italian and Allegra! in Romansh.
"Goodbye to summer!" in English is Addio all'estate! in Italian.
"Goodbye, my lover!" in English is Arrivederci, amante mio! in Italian.
goodbye
Ciao belisima
Adios.
Au revoir! in French is "Goodbye!" in English.
Ciao Bella
Tchau, bonito! in "Portuguese is "Goodbye, beautiful!" in English.
"So long, not goodbye" in English means A più tardi, ma non addio in Italian.
"Hallo und auf Wiedersehen"
Translation: Hola y adiós.