Induration (?), n. [Cf. F. induration, L. induratio hardness of heart.][1913 Webster]
1. The act of hardening, or the process of growing hard.[1913 Webster]
2. State of being indurated, or of having become hard.[1913 Webster]
3. Hardness of character, manner, sensibility, etc.; obduracy; stiffness; lack of pliancy or feeling.[1913 Webster]
A certain induration of character had arisen from long habits of business.