The Collaborative International Dictionary of English v.0.48:
inhumanely \inhumanely\ ([i^]n`h[=u]*m[=a]n"l[y^]), adv. In an inhumane manner. [PJC]WordNet (r) 3.0 (2006):
inhumanely adv 1: in an inhumane manner; "the prisoners of war were treated inhumanely" [ant: humanely]