Noun
inhumaneness evidenced by an unwillingness to be kind or forgiving
feelings of extreme heartlessness
Source: WordNetWhoso is full of sacred (religious, moral, humane) love loves only the spook, the "true man,” and persecutes with dull mercilessness the individual, the real man. Max Stirner
I am confident that the suppression of the Kazan Czechs and White Guards, and likewise of the bloodsucking kulaks who support them, will be a model of mercilessness. Vladimir Lenin