in·du·rate 
(
ĭn
d
ə-r
āt
′, -dy
ə-)
v. in·du·rat·ed, in·du·rat·ing, in·du·rates
v.tr.1. To make hard; harden: soil that had been indurated by extremes of climate.
2. To inure, as to hardship or ridicule.
3. To make callous or obdurate: "It is the curse of revolutionary calamities to indurate the heart" (Helen Maria Williams).
v.intr.1. To grow hard; harden.
2. To become firmly fixed or established.
adj. (
ĭn
d
-r
ĭt, -dy
ə-)
Hardened; obstinate; unfeeling.
[Latin indūrāre, indūrāt- : in-, intensive pref.; see IN-2 + dūrus, hard; see deru- in the Appendix of Indo-European roots.]
indu·ra′tive adj.