inexcitable
adjective
                                                                                                                            
                                                            in·ex·cit·able
                    
                                                                                                              
                                                                                                                                  ˌin-ik-ˈsīt-ə-bəl  
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : not readily excited or aroused                                      
                
                    
2
                    
                                of a nerve 
                                  
              
          
                                                      : not subject to excitation : not responsive to stimulation                                      
                
                    
Love words? Need even more definitions?
  
  Merriam-Webster unabridged




Share