the state of being alone in solitary isolation

a disposition toward being alone

Having a smaller or less satisfactory network of social and intimate relationships than one desires.

A feeling of deprivation about existing social relations.

Loneliness is an emotional state in which a person experiences a powerful feeling of emptiness and isolation. Loneliness is more than just the feeling of wanting company or wanting to do something with another person. Loneliness is a feeling of being cut off, disconnected from, and alienated towards, other people.