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English definition of “cast-iron”

cast-iron

adjective     /ˌkɑːstˈaɪən/ US  /ˌkæstˈaɪrn/
cast-iron guarantee, alibi, etc. a guarantee , alibi , etc. that can be trusted completely : Can you give me a cast-iron guarantee that the work will be completed on time ?CertaintyConfidence and self-assurance [before noun] very strong : He has a cast-iron stomach - he can eat anything.Power and intensityEnergy, force and powerHard and firm
(Definition of cast-iron adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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