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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.

Strict or exacting in standards
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“This tariff, it seems to me, is fashioned too much upon a cast-iron adherence to the doctrine that protection itself is a good thing found wherever it may be, no matter what it is.”
Certain or established as a rule or fact
“I am unable to give you a cast-iron guarantee that your job will be secure amidst this turmoil.”
Resolute or determined in one's will or purpose
“For two years, he fought a ferocious battle against the disease with a cast-iron will to live.”
Strong and durable, physically or figuratively
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“But my cast-iron faith in psychics began to rust when Derek Acorah was busted using made-up names for ghosts about as real as Cameron's and Clegg's election boasts.”
Firm, strong, or substantial
(somewhat rare) Not subject to change or dispute
Forbidding or grim in appearance
Justifiable by argument
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