[pit-i-lis, pit-ee-]
feeling or showing no pity; merciless: pitiless criticism of his last novel.

1375–1425; late Middle English piteles. See pity, -less

pitilessly, adverb
pitilessness, noun

piteous, pitiable, pitiful, pitiless (see synonym study at pitiful).

unmerciful, implacable, relentless. See cruel.

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pitiless (ˈpɪtɪlɪs)
having or showing little or no pity or mercy

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In the wink of an eye, insomnia slips from thought to obsession, from earnest
  doubt to pitiless masochism and misanthropy.
But this crisis has shone a pitiless light on that failure.
It arose-arises-from his willingness to devote real time to the pitiless search
  for the apt resonance.
Yet our pitiless political system tends to reward those who eat a consistently
  bland diet.
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