Strong alloy (4,4)
I believe the answer is:
cast iron
(Other definitions for cast iron that I've seen before include "safe" , "Unarguable; alloy" , "Brittle alloy" , "Certain" , "difficult to defeat" .)
I believe the answer is:
cast iron
(Other definitions for cast iron that I've seen before include "safe" , "Unarguable; alloy" , "Brittle alloy" , "Certain" , "difficult to defeat" .)