1. 
   sobering
   [adj] - tending to make sober or more serious
   Found op http://www.webdictionary.co.uk/definition.php?query=sobering
   
   
2. 
   sobering
   adjective tending to make sober or more serious; `the news had a sobering effect`
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=sobering
   
   
3. 
   Sobering
   • (p. pr. & vb. n.) of Sober
   Found op http://thinkexist.com/dictionary/meaning/sobering/
   
   
4. 
   sobering
   1) Serious 2) Tending to make sober or more serious 3) Type of thought
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/sobering/1
   
   

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