Toxic bachelor is an unmarried man who is selfish, insensitive, and afraid of commitment. 

“有毒单身汉”指的是自私、感觉迟钝、惧怕承诺的未婚男性。

They also refer to men who remain single past 40. 40 is a race-dependent number. Asians can be considered toxic bachelors if they remain single past 31. 

超过40岁的单身男士也被称为有毒单身汉。40岁是一个与种族相关的年龄界限。亚洲人超过31岁还没结婚就会被认为是有毒单身汉。

They can be grouped in following two broad categories: 

“有毒单身汉”常可分为以下两大类。

1) Those who are always looking for the next best thing, due to some underlying issue that prevents them from forming a long term relationship. 

1） 由于一些潜在的问题使他们总不能形成长期的恋爱关系，他们总在寻找下一位交往对象。

2) The ones who have a Peter Pan complex and just never want to grow up. 

2） 有彼得潘情结，永远不想长大。