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知った事ではない
shittakotodehanai
to be of no concern to one, to be nothing to do with one
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  1. shittakotodehanai to be of no concern to one, to be nothing to do with one
Nihoner AI Pronunciation Engine v3.2 · ja-JP

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Kanji Breakdown
知
Know, Wisdom
On: ち Kun: し.る,し.らせる
8 strokes N4
事
Matter, Thing, Fact, Business, Reason, Possibly
On: じ,ず Kun: こと,つか.う,つか.える
8 strokes N4
How to Use This Word
I-adjective (い形容詞)
Pattern
知った事ではない → 知った事ではなくない → 知った事ではなかった → 知った事ではなくて

💡 Drop い to get the stem: add くない (negative), かった (past), くて (te-form).

Example
とても知った事ではないですね。
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Lv 1
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