ぜんだいみもん 前代未聞 Common word LinksSentence search for 前代未聞Sentence search for ぜんだいみもんKanji details for 前, 代, 未 and 聞Edit in JMdict Noun, Noun which may take the genitive case particle 'no'1. unheard-of; unprecedented; unparalleled in history (unparallelled); record-breakingYojijukugo (four character compound) Discussions Log in to talk about this word.