[in.du.rate] adj (14c): physically or morally hardened
[2]in.du.rate vb -rat.ed ; -rat.ing [L induratus, pp. of indurare, fr. in- + durare to harden, fr. durus hard--more at during] vt (1538) 1: to make unfeeling, stubborn, or obdurate
2: to make hardy: inure
3: to make hard "great heat ~s clay"
4: to establish firmly: confirm ~ vi 1: to grow hard: harden
2: to become established