かつてない

unprecedented

→ 嘗て
phrase Rare #42,242
unprecedented Means something has never happened or existed before. Often used with ほど to mean “more than ever before.”
JA: 今年はかつてない暑さになった。
EN: This year, we experienced unprecedented heat.

彼はいまだかつてないぐらい偉大な物理学者である

He is the greatest physicist the world has ever known.

人々はかつてないほどの余暇を持っている

People have more leisure time than ever before.

日本今年かつてないほどの車を生産した

Japan produced more cars this year than ever before.