1. Insusceptible of reform
   - irreclaimable, irredeemable, unreformable

See also: wicked

• hard shoulder
• hard solder
• hard steel
• hard surface
• hard tick
• hard time
• hard times
• hard up
• hard water
• hard wheat
• hard worker
• hard-and-fast
• hard-baked
• hard-bitten
• hard-boiled
• hard-boiled egg
• hard-cooked egg
• hard-fought
• hard-hitting
• hard-nosed
• hard-of-hearing
• hard-on
• hard-pressed
• hard-shell
• hard-shell clam