This chap has let us down.

他这个人真不争气.

《现代汉英综合大词典》

My legs failed me and I wasn't able to run the last lap.

我这腿不争气,最后一圈跑不动了.

《现代汉英综合大词典》

He had again the corrosive sense of failure that always dogged him.

老是摆脱不掉的那种侵心的不争气之感,顿时又笼罩在他的心头.

辞典例句

I already knew about the lousy cars.

我已经知道那些个不争气的车子.

辞典例句

Success is self confident , failure fear the stronger others.

成功者不生气而是争气, 失败者生气而不争气.

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I'm not against you, and tears fell down, wet your clothes.

我真上不争气,靠着你, 眼泪就流下来了, 弄湿了你的衣服.

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All of those was reasons that I must prove myself.

所有这些都成为我争气的理由.

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Be a man , just stop calling her.

争气点, 不要打电话给她了.

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Naughty boys sometimes make good men.

淘气的男孩有时会成为争气的孩子.

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I am very quiet and stay in the dorm, counting the time flying silently.

很平静,很争气的整天在宿舍安静的呆着, 静静细数时光浅浅流逝.

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Nevertheless I am paltry giving up making a good showing, yet to write you this mail.

可是我却偏偏这么不争气, 还给你写邮件.

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