Main entry: harden, indurate, inure
Definition: cause to accept or become hardened to; habituate
Usage: He was inured to the cold
Definition: become hard or harder
Usage: The wax hardened
Definition: make hard or harder
Usage: The cold hardened the butter
Main entry: indurate
Definition: become fixed or established
Usage: indurated customs
Main entry: indurate, pachydermatous, callous
Definition: emotionally hardened
Usage: a callous indifference to suffering; cold-blooded and indurate to public opinion