A Quick Overview Of How To Say Addio
'Addio' means goodbye in Italian, but it is much more final than arrivederci. It is used like the French loan word adieu, so 'farewell' is the best translation. It is certainly not a word you would use with someone you expected to see again soon.
If you whispered 'addio, mi amore' to your Italian husband as he left for a regular day at work, he would probably spend it looking over his shoulder.
See also ciao.
How do you say 'goodbye' in French and Spanish?
This is an Italian word, so you pronounce each syllable. The stress is on the penultimate (second to last) syllable.