1 ADJ [verb-link ADJ] 没发生过的 You can say that an event or situation is unheard of when it never happens. 没发生过的
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Meals are taken communally with other guests in the dining-room. Private bathrooms and toilets are unheard of.
饭是在餐厅和其他宾客一起吃。私人浴室和卫生间更是闻所未闻。
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It's almost unheard of in France for a top politician not to come from the social elite.
在法国，大牌政客非社会精英阶层出身的几乎闻所未闻。
2 ADJ 令人震惊的；前所未有的 You can say that an event or situation is unheard of when it happens for the first time and is very surprising or shocking. 令人震惊的；前所未有的
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Long lines of people had queued up to buy at the unheard-of rate of two bottles of rum for $3.
人们排起了长队，以空前的速度抢购3美元两瓶的朗姆酒。
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Mom announced that she was going to visit her family for a couple of weeks, which was absolutely unheard of.
妈妈说她要回娘家几周，这绝对是前所未有的事。