hardened

definition: converted to solid form (as concrete)
example:
speech part: adjective
synonyms: set
definition: used of persons
example: emotionally hardened
speech part: adjective
synonyms: scheming
definition: protected against attack (especially by nuclear weapons)
example: hardened missile silos
speech part: adjective
synonyms:
definition: made hard or flexible or resilient especially by heat treatment
example:
speech part: adjective
synonyms: tempered treated toughened
definition: made tough by habitual exposure
example: hardened fishermen
speech part: adjective
synonyms: enured inured

How hardened is being used?