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同日の談ではない (どうじつのだんではない) Japanese meaning | Kotomora
Meanings 1
expression, i-adjective
cannot be compared ; not in the same league
idiomatic expression
Idiomatic expression meaning two things are so different they cannot be compared. Literally 'not a same-day discussion'. Used to emphasize a vast gap in quality, ability, or scale.
この 新しん 製せい 品ひん の 性せい 能のう は 旧きゅう モデル と は 同どう 日じつ の 談だん で は ない 。
The performance of this new product is in a completely different league from the old model.
Similar words 比くら べ 物もの にならない Similar meaning but more common and neutral. 同日の談ではない is more literary and emphatic.
雲うん 泥でい の 差さ Also means a vast difference, but is a noun phrase. 同日の談ではない is a full predicate expression.
Etymology The phrase originates from the idea that if two things are so different, they cannot even be discussed on the same day. The exact historical derivation is uncertain, but it is a set idiomatic expression.