1
                    as in tight
                                                
              
          
                                                      not allowing penetration (as by gas, liquid, or light)                                       
              
                             the material for this coat is supposed to be impervious to rain                         
                
                                                                                                                                                                                                                    
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2
                    as in dense
                                                
              
          
                                                      impossible to get through or into                                       
              
                             the rain forest is impervious to all but the most dedicated explorers                         
                
                                                                                                                                                                                                                    
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  Merriam-Webster unabridged




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