unforgiving
adjective /ˌʌnfəˈɡɪvɪŋ/
  /ˌʌnfərˈɡɪvɪŋ/
(formal)- (of a person) unwilling to forgive other people when they have done something wrong
- a proud and unforgiving man
 - I wonder what makes a man so unforgiving and hard?
 - She presented such a cold, unforgiving face to the world.
 
 - (of a place, situation, etc.) unpleasant and causing difficulties for people
- The island is an unforgiving place in winter.