Made of cast iron.
Inflexible or without exception.
Durable; tough; resilient.
A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould.
Covered with iron, steel, or some metal; armor-plated.
Solid or certain; not able to be disputed or questioned; irrefutable.
Rigorous; severe; exacting.
Stubborn; inflexible.
An armor-plated warship, (especially) one preceding the invention of harveyized steel.
A metal-plated ship, vessel, or vehicle.