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Adjective: case-hardened  keys haa(r)-d(u)nd
  1. Used of persons; emotionally hardened
    "faced a case-hardened judge";
    - hardened, hard-boiled
Verb: caseharden  'keys,haa(r)-d(u)n
  1. Harden the surface of iron or steel by infusing carbon into the surface layer
    "They casehardened the gears to improve wear resistance"
     
  2. Render (a person) insensitive to hardship or criticism
    "The harsh training casehardened the recruits"

See also: hard

Encyclopedia: Case-hardened