1. 习惯的：perplexed 迷惑的 | inured 习惯的 | impregnable 不可征服的

1. 对（令人不快的事物）司空见惯的;习惯于…的
    If you are inured to something unpleasant, you have become used to it so that it no longer affects you.

    e.g. Doctors become inured to death.
           医生们已经能坦然面对死亡。