前代未聞

ぜんだいみもん

Meanings

Adjective / Noun

common noun, no-adjective
1. unheard-of; unprecedented; unparalleled in history (unparallelled); record-breaking.

前	in front, before
代	substitute, change, convert, replace, period, age, counter for decades of ages, eras, etc., generation, charge, rate, fee
未	un-, not yet, hitherto, still, even now, sign of the ram, 1-3PM, eighth sign of Chinese zodiac
聞	hear, ask, listen

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