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English definition of “ironclad”

ironclad

adjective [usually before noun]     /ˈaɪən.klæd/ US  /ˈaɪrn-/
very certain and unlikely to be changed: ironclad rulesCertaintyConfidence and self-assurance
(Definition of ironclad adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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