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Ironclad

usgb/ˈaɪərnklæd/Volume
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LampPro Tip 1/2
Beyond DisputePlay
Use 'ironclad' to describe something so certain that it cannot be questioned. SlideHis alibi was ironclad; the jury believed him instantly.
LampPro Tip 2/2
Strong AssurancePlay
'Ironclad' can express a guarantee or promise deemed extremely reliable. SlideThe store's ironclad return policy made customers feel confident.