hardened in WordNet English dictionary

1. used of persons; emotionally hardened
   "faced a case-hardened judge"
   case-hardened  hardened  hard-boiled 
   
2. made tough by habitual exposure
   "hardened fishermen"; "a peasant, dark, lean-faced, wind-inured"- Robert Lynd; "our successors...may be graver, more inured and equable men"- V.S.Pritchett
   enured  inured  hardened 
   
3. made hard or flexible or resilient especially by heat treatment
   "a sword of tempered steel"; "tempered glass"
   tempered  treated  hardened  toughened 
   
4. protected against attack (especially by nuclear weapons)
   "hardened missile silos"
   hardened 
   
5. converted to solid form (as concrete)
   hardened  set