hardened

adjective5

1. •
   Made physically hard.
2. •
   Having been accustomed or desensitized to something unpleasant through exposure or experience; inured.

   • hardened police officers
3. •
   Unfeeling; pitiless; callous.

   • The bloody scene could reduce even the most hardened soldier to tears.
4. •
   Firmly established in a behavior seen as bad; unlikely to change one's ways; inveterate.
5. •
   Having extra defences against attack; highly fortified.