旷古未闻

Explanation: Since ancient times, had not. 　　Usage: Partial official; as object; that have not heard of since ancient times 　　Source: Ming Feng Meng "Jingshitongyan Wang Jiaoluan years Regret": "Wujiang Nanyang Que Da Yin Wei received the instruments apart to see, the deeply odd. The matter was gone with no news." 　　Examples: Wujiang Nanyang Que Da Yin Wei obtain access to documents, open look, the deeply strange. This ~. ★ Ming Feng Meng, "Jingshitongyan" Volume fourteen Thesaurus:  be never known before and never to occur again, unprecedented; have no precedent in history, unheard-of, peerless Antonym Group:  continuously or incessantly, (as) thick as hail, Continuum continuous, Continuous Without a break, continue continuous