Hardened against, or insusceptible to, good influences; rendered callous by persistence in wrongdoing or resistance of good influences; said of persons.
... was a pitiable object for some time. He not only suffered painfully from his bruises but had to meet the irate looks and casehardened bearing of his parents. Brutality made soldiers of visionary and idealistic temperaments. It kept the ... — Villa Elsa - A Story of German Family Life • Stuart Henry