1. Used of persons; emotionally hardened
   "faced a case-hardened judge"
   - hardened, hard-boiled

1. To subject to a process which converts the surface of iron into steel 
2. To render insensible to good influences

See also: hard

• operatic
• operatic star
• operatically
• operating
• operating budget
• operating capability
• operating capital
• operating cost
• operating expense
• operating instructions
• operating microscope
• operating procedure
• operating room
• operating statement
• operating surgeon
• operating system
• operating table
• operating theater
• operating theatre
• operation
• operation code
• Operation Desert Storm
• operational
• operational casualty
• operational cell