thriftier; thriftiest            
        
    1
                    
                                          
              
          
                                                      : given to or marked by economy and good management                                      
                
                    
2
                    
                                          
              
          
                                                      : thriving by industry and frugality : prosperous                                      
                
                    
3
                    
                                          
              
          
                                                      : growing vigorously                                      
                
                    
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  Merriam-Webster unabridged




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