Impossible to destroy, break, or damage no matter how hard you try.
From the prefix 'in-' (not) plus 'destructible' (able to be destroyed), from Latin 'destructus' (destroyed). The word has been used since the 17th century.
Nothing is truly indestructible—even diamonds can be burned at high enough temperatures—but humans keep searching for unbreakable materials, from medieval armor to modern space suits, because we're fascinated by the idea!
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