aloneness

From Middle English alonnesse; equivalent to alone +‎ -ness.

aloneness (countable and uncountable, plural alonenesses)

1. The state of being alone; solitude, isolation.
   • 1959, Anthony Burgess, Beds in the East (The Malayan Trilogy), published 1972, page 425:

     Suddenly, [...] he saw all this as romantic — the last legionary, his aloneness, the lost cause really lost — and instinctively he pulled in his paunch, stroked down his hair to cover the naked part of the scalp, and wiped the sweat off his cheeks.

• solitude