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Webster 1913 Edition

Noun.

Condition of being solitary.

Noun.

The state of being alone; forbearance of company; retirement, or habitual retirement. At home, in wholesome solitariness.

Solitude; loneliness; destitution of company or of animated beings; applied to place; as the solitariness of the country or of a wood.

solitariness ‎(countable and uncountable, plural solitarinesses)

The state or quality of being solitary.
- 1603, John Florio, translating Michel de Montaigne, Essayes, London: Edward Blount, OCLC 946730821, II.8:
  I saw a Deane of S. Hillarie of Poictiers, reduced by reason and the incommoditie of his melancholy to such a continuall solitarinesse, that when I entered into his chamber he had never removed one step out of it in two and twenty yeares before […].
- Bishop Joseph Hall
  So much as doing good is better than not doing evil, will I account Christian good fellowship better than an eremitish and melancholy solitariness.

state or quality of being solitary