1. (adj) case-hardened, hardened, hard-boiled
used of persons; emotionally hardened
"faced a case-hardened judge"
2. (adj) tempered, treated, hardened, toughened
made hard or flexible or resilient especially by heat treatment
"a sword of tempered steel"; "tempered glass"
3. (adj) hardened
protected against attack (especially by nuclear weapons)
"hardened missile silos"
4. (adj) enured, inured, hardened
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
5. (adj) hardened, set
converted to solid form (as concrete)
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Definitions of hardened 
