unforgiving

[uhn-fer-giv-ing]
adjective
1.
not disposed to forgive or show mercy; unrelenting.
2.
not allowing for mistakes, carelessness, or weakness: the unforgiving nature of aviation.

Origin:
1705–15; un-1 + forgiving

unforgivingness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unforgiving (ˌʌnfəˈɡɪvɪŋ)
 
adj
1.  not willing to forgive; unmerciful
2.  (of a machine, system, etc) allowing little or no opportunity for mistakes to be corrected
3.  harsh and unremitting: an unforgiving and desolate landscape

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Railroading is known to operate in a hostile, unforgiving environment.
His metabolism also appears to have been genetically fine-tuned for life in
  unforgiving cold climates.
Single mutations venture into an unforgiving ecosystem and test their mettle.
The breathing-space is important as the quarterly system can be brutally
  unforgiving.
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