hardened

adjective

1. 1

   converted to solid form (as concrete)

2. 2

   used of persons; emotionally hardened

   faced a case-hardened judge

3. 3

   protected against attack (especially by nuclear weapons)

   hardened missile silos

4. 4

   made hard or flexible or resilient especially by heat treatment

   a sword of tempered steel

   tempered glass

5. 5

   made tough by habitual exposure

   hardened fishermen

   a peasant, dark, lean-faced, wind-inured"- Robert Lynd