Verb
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cause to accept or become hardened to
habituate
"He was inured to the cold"
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become hard or harder
"The wax hardened"
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make hard or harder
"The cold hardened the butter"
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become fixed or established
"indurated customs"
Adjective
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emotionally hardened
"a callous indifference to suffering"
"cold-blooded and indurate to public opinion"