Either "Arrivederci" or "Ciao". But Ciao is hi too, so yeah. :)
Ciao!
In Slovenia, you can say "nasvidenje" to say goodbye.
In Cebuano, you can say "paalam" to say goodbye.
In Ibanag, you can say "Agyamanak!" to say goodbye.
In Zuni, you can say "yawakwi" to say goodbye.
I Will Say Goodbye was created in 1980.
In Swati, you can say "sala kahle" to say goodbye.
In Kpelle, you can say "Ka boss" to say goodbye.
In Dene, you can say "Mahsi cho" to say goodbye.
goodbye
Goodbye
Goodbye