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. Converted to solid form (as concrete)
   "The hardened concrete was ready for the next phase of construction";
   - set
    
4. Used of persons; emotionally hardened
   "faced a case-hardened judge";
   - case-hardened, hard-boiled
    
5. Protected against attack (especially by nuclear weapons)
   "hardened missile silos"

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. To accustom or habituate to something difficult or unpleasant
   "He was hardened to the cold";
   - inure, indurate, enure
    
5. Make or become tougher or more resilient through experience or exposure
   "The training hardened the recruits";
   - season

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

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

Antonym: soft, soften

Encyclopedia: Hardened