Hardened /(-'nd)/

Hard·ened

Hardened

a.
  1. Made hard, or harder, or compact; made unfeeling or callous; made obstinate or obdurate; confirmed in error or vice.
  2. Rendered resistant to the effects of nearby explosions; as, a hardened missile silo; hardened warhead electronics.
  3. Experienced and inured to hardship; as, hardened combat troops.
  4. Strongly habituated to a certain type of behavior, and unlikely to change; as, a hardened criminal. Usually used only of behavior perceived negatively.