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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. To harden the surface of iron or steel by infusing carbon into the surface layer
  2. To render insensible to hardship

See also: hard