1. 
   Placidness
   Plac'id·ness noun The quality or state of being placid.
   Found op http://www.encyclo.co.uk/webster/P/98
   
   
2. 
   placidness
   The quality or state of being placid. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?placidness
   
   
3. 
   Placidness
   • (n.) The quality or state of being placid.
   Found op http://thinkexist.com/dictionary/meaning/placidness/
   
   
4. 
   placidness
   1) Calmness 2) Placidity
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/placidness/1
   
   

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