His attack of the president was unsubstantiated.

an unsubstantiated claim/rumour, etc.

未经证实的说法、传言等

I do object to their claim, which I find totally unsubstantiated.

我强烈反对他们的说法，那是毫无根据的。

He made sexual advances to her in an unsubtle way.

他露骨地向她表明了性企图.

The novel has a compelling though unsubtle eloquence.

这部小说文笔虽欠细致,却有一种咄咄逼人的说服力.

The article has a compelling though unsubtle eloquence.

这篇文章辩术虽然不够严谨,但是有一种咄咄逼人的气势.

...a second unsuccessful operation on his knee...

他第二次失败的膝盖手术

She made several unsuccessful attempts to see him.

她几次想见他都未如愿。

Senator Biden , who himself had unsuccessful bid for the Party's nomination for president this year.

拜登今年早些时候也曾经争取过民主党总统候选人提名.

Q: Can I appeal if my application is unsuccessful?

如果我的申请是不成功的,那么我能上诉 吗 ?

They were unsuccessful in meeting their objectives for the year.

他们未能达到年度目标。

There were reports last month of unsuccessful negotiations between guerrillas and commanders.

有报道称上月游击队和指挥官之间的谈判失败。

The operation was unsuccessful and he died on 30 April, 1883 at the age of 51.

手术没有成功,马奈于1883年4月30日溘然长逝, 终年51岁.

The satellite launch was unsuccessful.

卫星发射失败了.

Unsuccessful at screen writing, he got a spot on a CNN film show.

写电影剧本未获成功后，他在美国有线新闻网的一档电影节目中争取到了一个固定时段。

The difference between successful and unsuccessful people is that successful people put into practice the things they learn...

成功者与失败者的区别在于成功者能够学以致用。

He and his friend Boris were unsuccessful in getting a job.

他和他朋友鲍里斯都没有找到工作。

He has been unsuccessful in his attempt to win a seat on the board of the company.

他始终未能如愿以偿地在公司董事会中谋得一席之地。

His efforts were unsuccessful.

他的努力失败了。

Unfortunately attempts to crossbreed it with other potatoes have been unsuccessful.

不幸的是，将它与其他土豆品种杂交的尝试均告失败。

She tries unsuccessfully to poison his mind against Elizabeth.

她竭力破坏他对伊丽莎白的好感,却未能成功.