Definition of peaceful adjective from the Oxford Advanced American Dictionary

      

    peaceful

     adjective
    adjective
    NAmE//ˈpisfl//
     
     
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  1. 1not involving a war, violence, or argument a peaceful protest/demonstration/solution They hope for a peaceful settlement of the dispute. people of different religions living in peaceful coexistence
  2. 2quiet and calm; not worried or disturbed in any way synonym tranquil a peaceful atmosphere peaceful sleep It's so peaceful out here in the country. He had a peaceful life.
  3. 3trying to create peace or to live in peace; not liking violence or disagreement synonym peaceable a peaceful society The aims of the organization are wholly peaceful.
NAmE//ˈpisfəli//
 
adverb The siege has ended peacefully. The baby slept peacefully. He died peacefully in her arms.
peacefulness
 
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noun [uncountable] Which Word?peace / peacefulness The noun peace can be used to talk about a peaceful state or situation:world peace I just need some peace and quiet.Peacefulness is not a common word. It means “the quality of being peaceful.” a sense of calm and inner peacefulness
See the Oxford Advanced Learner's Dictionary entry: peaceful