What is another word for cast-iron?

Need synonyms for cast-iron? Here's a list of similar words from our thesaurus that you can use instead.

Not allowing for any exceptions or loosening of standards
“… lost weight only after a cast-iron adherence to his diet.”
Able to withstand hardship, strain, or exposure
“… he has a cast-iron faith in his innate ability to overcome any adversity that life might throw against him.”
Made of cast iron
“I can't give you any cast-iron guarantees that your job will be safe.”
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