unsociableness

from WordNet (r) 3.0 (2006)

unsociableness
    n 1: an unsociable disposition; avoiding friendship or
         companionship [syn: {unsociability}, {unsociableness}]
         [ant: {sociability}, {sociableness}]

from The Collaborative International Dictionary of English v.0.48

Unsociable \Un*so"cia*ble\, a.
   Not sociable; not inclined to society; averse to
   companionship or conversation; solitary; reserved; as, an
   unsociable person or temper. -- {Un*so"cia*ble*ness}, n. --
   {Un*so"cia*bly}, adv.
   [1913 Webster]