unobtrusive
adjective
                                                                                                                            
                                                            un·ob·tru·sive
                    
                                                                                                              
                                                                                                                                  ˌən-əb-ˈtrü-siv  
                                                                                                                              
            -ziv
                                                      
                                                          
                                
              
          
                                                      : not obtrusive : not blatant, arresting, or aggressive : inconspicuous                                      
                
                    
                                                      unobtrusively
                                      adverb
                                                                            
    
                                                      unobtrusiveness
                                      noun
                                                                            
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  Merriam-Webster unabridged




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