nemesis [ˈneməsɪs]

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n.给以报应者，复仇者，难以对付的敌手

Someone's nemesis is a person or thing that is very difficult for them to defeat .

Uncritical trust is my nemesis. 盲目的相信一切害了我自己。
Inward suffering is the worst of Nemesis. 内心的痛苦是最厉害的惩罚。