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                                                      : made of cast iron                                      
                
                    
2
                    
                                          
              
          
                                                      : resembling cast iron: such as                                      
                
                    
        a
    
          
                                          
              
          
                                                      : capable of withstanding great strain                                      
              
                             
a cast-iron stomach
                         
                
                    
        b
    
          
                                          
              
          
                                                      : not admitting change, adaptation, or exception : rigid                                      
              
                             
a cast-iron will
                         
                
                    
        c
    
          
                                British 
                                  
              
          
                                                      : not likely to fail or be broken : airtight                                      
              
                             
"Clever idea, Black, getting yourself seen on a safe station platform … gave you a cast-iron excuse not to leave your hidey-hole in future, didn't it?"— J. K. Rowling
J. K. Rowling
                         
                
                    
                                
              
          
                                                      : a commercial alloy of iron, carbon, and silicon that is cast in a mold and is hard, brittle, nonmalleable, and incapable of being hammer-welded but more easily fusible than steel                                      
                
                    
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  Merriam-Webster unabridged




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