Better translation for "underdog"? Underdog has a lot of mediocre translations 

ABC English-Chinese gives:


  处于劣势的一方


Oxford has:


  弱者


which is okay and:


  失败者
  失败的一方


which don't really match the meaning of underdog to begin with.

New Century English gives:


  居于下风者


Except for 弱者, the rest are quite wordy. While 弱者 itself is alright it's a bit ambiguous without the proper context.

Are there no better colloquial translations of underdog?
Mined from an opinion post (http://blog.sciencenet.cn/blog-39731-510338.html):


劣勢者
弱勢者
新[入/行/進]者
後來者


I personally prefer the first one as the best translation; 弱勢 is a bit broader in meaning as it can mean weak in general rather than in comparison to something. The other ones just mean newcomer, so the disadvantage of being an underdog is only implied rather than explicitly stated.

You may also want to check out 弱旅 (opposite: 勁旅).