Define loneliness

[thir]

To me loneliness is that pit you get in your stomach when you go to reach for someone in the middle of night and they aren't in bed next to you. The ache in your heart when you think of someone that's no longer around and wish that they were still with you. Of course some might associate those feelings with grief as well and they wouldn't be wrong, to me they run very close at hand.
DLO

I agree. You can be lonely for someone who is no longer alive, leaving a 'him' shaped hole in you life.