dustier; dustiest            
        
    1
                    
                                          
              
          
                                                      : covered or abounding with dust                                      
                
                    
2
                    
                                          
              
          
                                                      : consisting of dust : powdery                                      
                
                    
3
                    
                                          
              
          
                                                      : resembling dust                                      
                
                    
4
                    
                                          
              
          
                                                      : lacking vitality : dry                                      
              
                             
dusty scholarship
                         
                
                    5
                    
                                British 
                                  
              
          
                                                      : unsatisfactory                                      
                
                  —used especially in the phrases dusty answer and not so dusty
    
                
                    
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  Merriam-Webster unabridged




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