资料来源 : pyDict

经热处理变硬的,无感觉的,厚脸皮的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Casehardened \Case"hard`ened\, a.
   1. Having the surface hardened, as iron tools.

   2. Hardened against, or insusceptible to, good influences;
      rendered callous by persistence in wrongdoing or
      resistance of good influences; -- said of persons.