もうしわけない
sorry, inexcusable
You have run out of excuses and you are saying so out loud. The same もう as already, a わけ of a reason, and Bill Nye ない has taken the last of them: もうしわけない.
The formal apology, for work and for strangers. ごめん is what you say to a friend.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.