Verbs

(v)induratebecome fixed or established“indurated customs”
(v)harden, induratemake hard or harder“The cold hardened the butter”
(v)harden, induratebecome hard or harder“The wax hardened”
(v)inure, harden, induratecause to accept or become hardened to; habituate“He was inured to the cold”

Adjectives

(s)callous, indurate, pachydermatousemotionally hardened“a callous indifference to suffering”, “cold-blooded and indurate to public opinion”