peaceful vs rippleless

peaceful

adj
  • Not at war; not disturbed by strife or turmoil. 

  • Motionless and calm. 

  • Inclined to peace. 

noun
  • a Muslim; especially a violent member of a radical Islamist group. 

rippleless

adj
  • Without ripples. 

How often have the words peaceful and rippleless occurred in a corpus of books? (source: Google Ngram Viewer )