一、【反义词】
人人皆知，家喻户晓，举世闻名，人所共知
二、【基本解释】
【解释】：闻：听到。听到了从来没有听到过的事。形容事物新奇罕见。
【出自】：《史记·郦生陆贾列传》：“越中无足与语，至生来，令我日闻所未闻。”
【示例】：今日见了紫菱姐姐飞来飞去，业已奇极;谁知还有海外这些异事，真是～。
◎清·李汝珍《镜花缘》第六十回
三、【英文翻译】
1.have never even heard of it;hear of many strange things which one has hitherto been unaware of;hear what one has never heard before;It has never been heard of before. ;
四、【短语造句】
1.然而不同种动物之间直接交换dna则是闻所未闻。
But animals swapping dna directly with oneanother is previously unheard of.
2.当然，这是一种极端的情况，但它远非闻所未闻的事情。
Of course, this is an extreme situation, but it is far from unheard of.
3.如果一家公司聘请的审计机构你闻所未闻，你也要小心。
Watch out, too, if the company has auditors you have never heard of.
4.即使是对地理一窍不通、在政治方面感觉迟钝的人当中也几乎无人对美国闻所未闻。
Even the geographically illiterate and politically unaware have heard of the united states.
5.斯德哥尔摩地铁的公告栏上充斥着招聘清洁工的广告，这曾是闻所未闻的奢侈。
Notice boards at stockholm's suburban railway stations are filled with advertisements for cleaners, once an unheard-of luxury.