alone.
If it's true that our species is alone in the universe, then I'd have to say the universe aimed rather low and settled for very little.
In Genesis, it says that it is not good for a man to be alone but sometimes it is a great relief.
Even in the presence of others he was completely alone.
presence of others, completely alone
When so many are lonely as seem to be lonely, it would be inexcusably selfish to be lonely alone.
Absolutely lonely people have few personal interactions of any kind.
ALONE, INTERACTIONS OF ANY KIND
There are places and moments in which one is so completely alone that one sees the world entire.
It's often just enough to be with someone. I don't need to touch them. Not even talk. A feeling passes between you both. You're not alone.