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

• one-flowered pyrola
• one-flowered wintergreen
• one-fourth
• one-half
• one-handed
• one-hitter
• one-horse
• one-horse town
• one-humped
• one-hundred-millionth
• one-hundred-thousandth
• one-hundredth
• one-liner
• one-man
• one-man rule
• one-member
• one-millionth
• one-night stand
• one-ninth
• one-off
• one-on-one
• one-party
• one-person
• one-piece
• one-quadrillionth