Definitions
without flaws or loopholes
Word origin
From iron + clad.
Used in a sentence
“Unlike the average vehicle, cash delivery vans are ironclad and almost unstoppable.”
“In that flickering pallor it had the effect of a large and clumsy black insect, an insect the size of an ironclad cruiser, crawling obliquely to the first line of trenches and firing shots out of portholes in its side.”
“The suspect had an ironclad alibi for his whereabouts on the night of the crime.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Impossible to break”8 letters
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