loneliness is defined as a discrepancy between the social life one has and the social life one would like to have.
the opposite of loneliness is shared agency.
There is a virtuous circle here: we need agency to work with one another, and we need one another to realize our own agency.
Loneliness is not soporific, like depression; it is depression’s frenetic cousin, goading us to seek some sense of belonging, however ill-conceived or dangerous.
https://www.commonwealmagazine.org/whats-behind-americas-loneliness-crisis