Hello everyone, is this word 閣下 propriate for "Your excellency". Thank you
For some reason I was expecting you to say 陛下 (へいか) instead. However, 陛下 is more specific to monarchs and means something closer to "Majesty" than "Excellency".
I've seen 閣下 (かっか) used when talking about foreign presidents and prime ministers.
"His Excellency President Donald Trump" ^^
↑ This 2-minute BBC Japan youtube video is interesting in relation to your question. The part where 閣下 is used begins at around 1:07.