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.

Adjective
Strict or exacting in standards
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Adjective
Able to withstand strain or hardship
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Adjective
Made of cast iron
“I can't give you any cast-iron guarantees that your job will be safe.”
Adjective
Firm, strong, or substantial
Adjective
Incapable of being changed or of changing
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Adjective
Unable to be disputed or questioned
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Adjective
Justifiable by argument
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Adjective
Forbidding or grim in appearance
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