noun
unheard; unprecedented
Rarely used independently; almost always appears in the set phrase 前代未聞 (ぜんだいみもん), meaning 'unprecedented' or 'unheard of in history'.
See also: 前代未聞
「前代未聞」という言葉の中で使われる。
It is used in the phrase 前代未聞.
その事件はまさに前代未聞の大惨事だった。
That incident was truly an unprecedented catastrophe.