1.  be disappointing
2.  fail to live up to sb's expectations
3.  submit to defeat or failure without putting up a fight
4.  be easily discouraged
5.  let sb . down

• 1. 不争气: be disappointing

• 1.我这腿不争气， 最后一圈我跑不动了。
  My legs failed me and I wasn't able to run the last lap.
  dict.yoduao.com
• 2.他这个人真不争气。
  This chap has let us down.
  dict.yoduao.com
• 3.我已经知道那些个不争气的车子。
  I already knew about the lousy cars.
  dict.yoduao.com

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