...sadness or the loneliness. I believe the two are entities in themselves. I have been lonely but not sad. Being alone or feeling out of sorts can make one sad but, in my case, it does not apply. If you can see the light at the end of the tunnel, the sadness is fleeting, while the loneliness can be rectified by calling friends and just being in the presence of people who care about you.
Simple and short....I am not sad. I am a bit lonely but that will change...soon!