The Collaborative International Dictionary of English v.0.48:
Unmerciful \Un*mer"ci*ful\, a. Not merciful; indisposed to mercy or grace; cruel; inhuman; merciless; unkind. -- Un*mer"ci*ful*ly, adv. -- Un*mer"ci*ful*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
unmerciful adj 1: having or showing no mercy; "the merciless enemy"; "a merciless critic"; "gave him a merciless beating" [syn: merciless, unmerciful] [ant: merciful]