Premonitions of future undreamt-of happiness made her heart beat.

预感到未来从未有过的幸福，她的心怦怦直跳。

youdao

Many Chinese enjoy a prosperity undreamt of by their forefathers.

很多中国人享受着他们祖辈连做梦都想不到的繁荣富强。

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Something undreamt of was lurking everywhere and the uppermost question every day was: when, Oh! When would we come across it?

我感到每一个地方都隐藏着这种神秘。每天，我心里产生的最大问题是：什么时候，啊！

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Radio frequency identification and tracking technology were undreamt of just a few years ago.

FORBES: How Blur Devours Brands

The two-party system was undreamt of by the founders of the Republic.

FORBES

Fax machines, let alone computers, are still undreamt-of luxuries for most.

ECONOMIST: Old Bolivian customs