1. 
   harshen
   [v] - make harsh or harsher
   Found op http://www.webdictionary.co.uk/definition.php?query=harshen
   
   
2. 
   harshen
   verb make harsh or harsher; `Winter harshened the look of the city`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=harshen
   
   
3. 
   harshen
   1) Alter 2) Change 3) Make harsh or harsher 4) Modify
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/harshen/1
   
   

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