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1. Made tough by habitual exposure
   "hardened fishermen";
   - enured, inured
    
2. Made hard, flexible or resilient especially by heat treatment
   "a sword of hardened steel";
   - tempered, treated, toughened
    
3. Protected against attack (especially by nuclear weapons)
   "hardened missile silos"
    
4. Used of persons; emotionally hardened
   "faced a case-hardened judge";
   - case-hardened, hard-boiled
    
5. Converted to solid form (as concrete)
   - set

1. Become hard or harder
   "The wax hardened";
   - indurate
    
2. Make hard or harder
   "The cold hardened the butter";
   - indurate
    
3. Harden by reheating and cooling in oil
   "harden steel";
   - temper
    
4. Make healthy
   "This trip will harden even the hardiest traveller";
   - season
    
5. Cause to accept or become hardened to; habituate
   "He was hardened to the cold";
   - inure, indurate, enure

See also: curable, hard, sunbaked, tough, toughened

Type of: accustom, change, habituate, modify, toughen

Antonym: soft, untempered

Encyclopedia: Hardened