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

• spectrophotometer
• spectroscope
• spectroscopic
• spectroscopic analysis
• spectroscopical
• spectroscopist
• spectroscopy
• spectrum
• spectrum analysis
• spectrum line
• specular
• speculate
• speculation
• speculative
• speculatively
• speculativeness
• speculator
• speculatory
• speculum
• thane
• thaneship
• thank
• thank offering
• thank you
• thankful