DICT.TW Dictionary Taiwan

 casehardened
 (a.)經熱處理變硬的,無感覺的,厚臉皮的

 Case·hard·ened a.
 1. Having the surface hardened, as iron tools.
 2. Hardened against, or insusceptible to, good influences; rendered callous by persistence in wrongdoing or resistance of good influences; -- said of persons.
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 case-hardened
      adj : used of persons; emotionally hardened; "faced a
            case-hardened judge" [syn: hardened, hard-boiled]