可能是语言差异，汉语对于loser的理解应该是失败后萎靡不振的人或者颓废不堪的人，要知道失败后不气馁的人不是loser 所以颓废的人，没用处的人都可以被称为loser，也就是说汉语中是一个形容词 + 的人来描述就好 我按照你的要求想了想（庸人习气，懦夫行径）应该是你想要的loser，还有丧家之犬给我的一种loser的感觉 懦夫： 软弱无所作为的人 庸人：碌碌无为的人，无作为的人，没能耐的人 丧家犬：失魂落魄，无家可归的人 如果我的回答你觉满意~发email给我(sunnyxinbo@hotmail.com)~一起交流语言文化~

The term 废物 is the one I hear the most. Someone else said they think it's northern slang, but my friends are all Taiwanese and they use this word all the time. So I think Chinese speakers everywhere use it. People can use it in a joking way with friends or they can use it like an insult. You can also use it to refer to yourself. For example 我最近都在家里当废物 If you want a less slang way to express something close to the meaning of loser you can use the term 没出息, it literally translates to 'no prospects', but it's basically like calling someone a loser. I watch a tv series where the main character works in a drinks shop and his family always tell him 你没出息. I think this is a term that is OK for written language Also I used to read a lot online about the term 吊丝. It must be a term that is most,y used in mainland China because I have never heard my Taiwanese friends use it. Apparently it also means loser, but some people use it to refer to themselves. My impression is that it's similar to a youth subculture, but I'm not qualified to explain it really I'm not a native speaker, but I hope my answer is helpful taken in conjunction with the other answers.

‘Loser’的这种用法在汉语里恐怕没有对等的词，只能根据不同的语境选择不同的词： 1. 倒霉鬼 （neutral）/ 倒霉蛋 （derogative） 2. 废物/ 废物点心（northern vulgar slang） 3. 傻吊（diao3）/傻逼 （both offensive, but...）

You can use 咸鱼 have you heard of咸鱼翻身。It's metaphorical. or you can use 废柴。 But both words are for oral use. Don't use them in formal context. I think 失败者is good for formal context.

chinesespeakerhy说得很好。 我觉得还是“废物”最好，或者“垃圾”也行。不是很粗俗，而且也不会觉得太不常用。 最近在网络上很流行的一句话“我不是针对谁，我的意思是，在座的都是垃圾”。 倒霉鬼/倒霉蛋，我从来不说。可能南方人会说？ 傻逼/傻屌，是有点粗俗的。书面里不用。