hardened

1. Made physically hard.

   hardened steel

   made hard or flexible or resilient especially by heat treatment

2. Having been accustomed or desensitized to something unpleasant through exposure or experience; inured.

   hardened police officers

   gehärtet

3. Unfeeling; pitiless; callous.

   The bloody scene could reduce even the most hardened soldier to tears.

   abgehärtet, verhärtet

   огрубе́вшийogrubévšij

4. Firmly established in a behavior seen as bad; unlikely to change one's ways; inveterate.

   hardened criminals

5. Having extra defences against attack; highly fortified.

   a hardened air base

   a hardened server

   protected against attack (especially by nuclear weapons)

правильный