1
                    
        a
    
          
                                          
              
          
                                                      : vigor and strength of spirit or temperament (see temperament sense 1a)                                      
              
                             
a girl of … mettle who lost a baby brother to leukemia— Bill Zehme
Bill Zehme
                         
                
                    
        b
    
          
                                          
              
          
                                                      : staying quality : stamina                                      
              
                             
equipment that proved its mettle
                                       proved his mettle in battle
                         
                
                    2
                    
                                          
              
          
                                                      : quality of temperament or disposition                                      
              
                             
gentlemen of brave mettle— William Shakespeare
William Shakespeare
                         
                
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  Merriam-Webster unabridged




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