1. 顽固的：unreliability 不可靠性 | unrepentant 顽固的 | unresectable 不可切除的

2. 不悔改：unrendered /未抹灰的/ | unrepentant /不悔改/ | unrepresentative /无代表性的/

1. 不思悔改的；不悔悟的；不知羞耻的
    If you are unrepentant, you are not ashamed of your beliefs or actions.

unrepentant

    e.g. Pamela was unrepentant about her strong language and abrasive remarks.
           帕梅拉对自己那些脏话和伤人的言辞一点也不感到羞愧。
    e.g. ...unrepentant defenders of the death penalty.
           顽固不化地赞成死刑的人

1. not penitent or remorseful

    Synonym: impenitentunremorseful

2. stubbornly persistent in wrongdoing

    Synonym: cussedobdurateobstinate