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どうして v. なんで v. なぜ

GaijinMiki

日本が好きな女の子
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Is there a difference between these?

I heard once that 何故(なぜ) is more forceful and impolite. I am not sure about the other two though...

Example sentences:
どうして彼が洗濯したかしら...
何故そのホテルで泊まったの?
なんで寝ってるな。
 
Last edited:
なんで is colloquial, but they have basically the same meaning when used as "why".
どうして also can mean "how"; どうして開ければいいのかわからない(= どうやって開ければいいのかわからない) "I don't know how to open it". Furthermore, なんで can indicate the means; なんで(=なにで)払いますか?現金ですか?カードですか?
 
Ah, thank you for the clarification! I will safely assume that what I heard about 何故 is correct then.
 
Another difference is that I've only ever heard the following phrase
なぜなら、

And never these
なんでなら
どうしてなら
 
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