The Collaborative International Dictionary of English v.0.48:

inhumaneness \inhumaneness\ n.
   the quality of lacking compassion or consideration for
   others; the quality of being inhumane; inhumanity; -- of
   people or events.

   Syn: inhumanity.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

inhumaneness
    n 1: the quality of lacking compassion or consideration for
         others [syn: inhumaneness, inhumanity] [ant:
         humaneness]