alone.
In Genesis, it says that it is not good for a man to be alone but sometimes it is a great relief.
A man is born alone and dies alone and he experiences the good and bad consequences of his karma alone and he goes alone to hell or the Supreme abode.
Love is our true destiny. We do not find the meaning of life by ourselves alone - we find it with another.
I love to be alone. I never found the companion that was so companionable as solitude.
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.
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.