Meaning of ぜんだいみもん in Japanese
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Definition of ぜんだいみもん
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(n, adj-no) unheard-of; unprecedented; unparalleled in history (unparallelled); record-breaking
犯人を弁護してた弁護士が実は真犯人だったなんて、前代未聞だ。
It's totally without precedent for the suspect's attorney to be the true culprit.