The Collaborative International Dictionary of English v.0.48:

Inhospitable \In*hos"pi*ta*ble\, a. [Pref. in- not + hospitable:
   cf. L. inhospitalis.]
   [1913 Webster]
   1. Not hospitable; not disposed to show hospitality to
      strangers or guests; as, an inhospitable person or people.
      [1913 Webster]

            Have you no touch of pity, that the poor
            Stand starved at your inhospitable door? --Cowper.
      [1913 Webster]

   2. Affording no shelter or sustenance; barren; desert; bleak;
      cheerless; wild. "Inhospitable wastes." --Blair. --
      In*hos"pi*ta*ble*ness, n. -- In*hos"pi*ta*bly, adv.
      [1913 Webster]

WordNet (r) 3.0 (2006):

inhospitableness
    n 1: the environmental condition in a region that lacks a
         favorable climate or terrain for life or growth
    2: having an unfriendly and inhospitable disposition [ant:
       hospitableness]