なんで
why, what for
What for, said with a shrug rather than a raised eyebrow. The same nanny なん as 何, throwing up her hands. She said she was coming and she is not here: なんで.
なぜ is the plain why and どうして sits between the two. 何で is the casual spoken one.
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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.