Induration
Induration , noun
[Compare French induration, Latin induratio hardness of heart.]
1.
The act of hardening, or the process of growing hard.
2.
State of being indurated, or of having become hard.
3.
Hardness of character, manner, sensibility, etc.; obduracy; stiffness; lack of pliancy or feeling.
A certain induration of character had arisen from long habits of business.