imperturbable
adjective
                                                                                                                            
                                                            im·per·turb·able
                    
                                                                                                              
                                                                                                                                  ˌim-pər-ˈtər-bə-bəl  
                                                      
                                                          
            
                                
              
          
                                                      : marked by extreme calm, impassivity, and steadiness : serene                                      
                
                    
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  Merriam-Webster unabridged




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