前ぜん代だい未み聞もん

ぜ

ん

だ

い

み

も

ん

Common wordFreq.FrequencyTop 20,000

Meanings

1

noun, noun which may take the genitive case particle 'no'

Emphasizes that something has never been heard of or seen before in history; often used in news for extraordinary events.

これは前ぜん代だい未み聞もんの大だい災さい害がいだ。

This is an unprecedented catastrophe.

前ぜん代だい未み聞もんの記き録ろくを達たっ成せいした。

They achieved a record-breaking feat.

前ぜん代だい未み聞もんの〈事こと〉an unprecedented ~ (event, incident, etc.)
前ぜん代だい未み聞もんの事じ件けんが世せ間けんを騒さわがせた。
The unprecedented incident caused a stir throughout society.
前ぜん代だい未み聞もんの〈事こと〉が起おこるan unheard-of ~ occurs
その村むらで前ぜん代だい未み聞もんの出で来き事ごとが起おこった。
An unheard-of event occurred in that village.

未み曾ぞ有う
前代未聞 and 未曾有 both mean 'unprecedented', but 未曾有 is more formal and typically used for disasters or crises while 前代未聞 fits surprising news or achievements too.
空くう前ぜん絶ぜつ後ご
空前絶後 makes the stronger claim that something will never happen again, whereas 前代未聞 only asserts it has never been heard of before now.
空くう前ぜん
前代未聞 stresses that something is unheard of in history, often with surprise or scandal, whereas 空前 is more neutral and factual.

A yojijukugo composed of 前代 (previous era) and 未聞 (not yet heard), literally 'unheard of in previous eras'.