solitariness

from WordNet (r) 3.0 (2006)

solitariness
    n 1: the state of being alone in solitary isolation [syn:
         {loneliness}, {solitariness}]
    2: a disposition toward being alone [syn: {aloneness},
       {loneliness}, {lonesomeness}, {solitariness}]

from The Collaborative International Dictionary of English v.0.48

Solitariness \Sol"i*ta*ri*ness\, n.
   Condition of being solitary.
   [1913 Webster]