Pronunciation: /ˈhɑːdənd/
adjective
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1having become or been made hard or harder: hardened steel
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strengthened or made secure against attack, especially by nuclear weapons: the silos are hardened against air attack
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2 [attributive] very experienced in a particular job or activity and therefore not easily upset by its more unpleasant aspects: hardened police officers [in combination]: a battle-hardened veteran
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utterly fixed in a habit or way of life seen as bad: hardened criminals a hardened liar