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Discover Ludwig"been hardened" is correct and usable in written English.
It is used as the past participle of the verb "harden", and is often used in the passive voice. For example: "My heart has been hardened by a bitter betrayal."
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Generally, that has now been hardened.
If anything, public attitudes have been hardened by austerity.
Having been hardened by experience, many people develop a more fatalistic view of friendship.
Weaned steers fetch higher prices because they have been hardened by circumstance and do not bellow.
Concrete that has been hardened onto imbedded metal (usually steel) is called reinforced concrete, or ferroconcrete.
Two years on, her support for Balakrishnan has only been hardened by his trial and conviction.
Where are the examples of how our homeland security has been hardened since 9/11?
After entering last season with unrestrained optimism, Marbury has been hardened by losing.
Inflame and quench, repeat many times over, until anxiety has been hardened into hatred.
"We've been hardened along the way," he said, pointing to matches against the world's toughest teams, including England.
In Mantel's narrative, Cromwell has been hardened and enlarged by the abuses and travels of his youth.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com