Unmerciful
Pronunciation : Un*mer"ci*ful
Part of Speech : a.
Definition : Defn: Not merciful; indisposed to mercy or grace; cruel; inhuman; merciless; unkind. -- Un*mer"ci*ful*ly, adv. -- Un*mer"ci*ful*ness, n.
Source : Webster's Unabridged Dictionary, 1913