Meaning of hardened

hard•ened

Pronunciation: (här'dnd), [key]
— adj.
  1. made or become hard or harder.
  2. pitiless; unfeeling.
  3. firmly established or unlikely to change; inveterate: a hardened criminal.
  4. inured; toughened: a hardened trooper.
  5. rigid; unyielding: a hardened attitude.
  6. (of a missile base) equipped to launch missiles from underground silos.
  7. (of a missile) capable of being launched from an underground silo.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also: