cast-iron

A hard and brittle, but strong, alloy of iron, carbon, and silicon, formed by casting in a mould.

“Cast iron is popular for cookware where an even heating temperature is important.”

Made of cast iron.

“I use a cast-iron skillet for frying pancakes.”

Durable; tough; resiliant.

“Ernest has a cast-iron constitution and never gets sick.”

Inflexible or without exception.

“The school's cast-iron policy on admissions fees left no leeway for needy students.”