Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

unsociable
     adj : not inclined to society or companionship; "an unsociable
           nature...shy and reserved"; "generally unsociable
           except with intimate friends"; "unsociable behavior";
           "an unsociable neighborhood" [ant: {sociable}]