unheard-of /ˌʌnˈhɚdˌʌv/ adjective Learner's definition of UNHEARD-OF
: not known to have existed or happened before : very unusual从未听说过的;前所未闻的;空前的 -
In those days, indoor plumbing was almost unheard-of. [=very few people had indoor plumbing]在那个年代,室内管道几乎没人听说过。
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He was hired for an unheard-of salary of more than a million dollars.他得到一份一百多万美元薪水的工作,这样的薪水是前所未闻的。
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It's not unheard-of for a patient's condition to improve this quickly.患者的病情好得这么快,这在以前不是没有发生过。