旷古未有: never seen in past history; unprecedented in history
旷古未闻: unheard-of; never heard of in history; unprecedented
Example Sentences:
1.
Avoid the defilements of delusion and discrimination . discover the ancient secret of life and death 烦恼是妄想分别，应该要远离；生死是旷古秘密，应该要探究。
2.
Writing in english is the most ingenious torture ever devised for sins committed in previous lives . the english reading public explains the reason why 以英文写作真是旷古未有的煎熬，但古圣先贤亦甘冒大不韪而为之。英文的阅读大众当也有同感。
