a. Having no precedent or example; not preceded by a like case; not having the authority of prior example; novel; new; unexampled. -- Un*prec"e*dent*ed*ly, adv. [1913 Webster]
[大跃进 / 大躍進, dà yuè jìn, ㄉㄚˋ ㄩㄝˋ ㄐㄧㄣˋ]the Great Leap Forward (1958-1960), in retrospect widely viewed as an unprecedented economic and social disaster, with estimated 20 million people dying of starvation#14894[Add to Longdo]
[旷古未闻 / 曠古未聞, kuàng gǔ wèi wén, ㄎㄨㄤˋ ㄍㄨˇ ㄨㄟˋ ㄨㄣˊ]never before in the whole of history (成语 saw); unprecedented; also written 曠古未有|旷古未有#337120[Add to Longdo]
[じんむいらい;じんむこのかた, jinmuirai ; jinmukonokata](adj-no, n-adv, n-t) since the era of the Emperor Jinmu; (first ever) since the dawn of Japan's history; unprecedented[Add to Longdo]