Definition of placid adjective from the Oxford Advanced American Dictionary

     

    placid

     adjective
    adjective
    NAmE//ˈplæsɪd//
     
     
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  1. 1(of a person or an animal) not easily excited or irritated a placid baby/horse opposite high-spirited
  2. 2calm and peaceful, with very little movement synonym tranquil the placid waters of the lake
NAmE//pləˈsɪdət̮i//
 
noun [uncountable]
NAmE//ˈplæsɪdli//
 
adverb “Of course,” said Helen placidly. The river sparkled placidly in the sun.
See the Oxford Advanced Learner's Dictionary entry: placid