mercilessness
Noun
Meaning
inhumaneness evidenced by an unwillingness to be kind or forgiving
feelings of extreme heartlessness
Source: WordNetSynonyms
ruthlessness
cruelty
pitilessness
unmercifulness
malice
meanness
violence
evil
spite
severity
hardness
indifference
brutality
wickedness
ferocity
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Examples
Whoso 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.
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.