► 代名詞
何故 [なにゆえ] [liter] meaning: why rank: 3
☆ 人は何故に生きるのか ⇨ For what does a human live?
► 副詞
どうして [(1)どうして] meaning: why rank: 1
☆ どうして今まで黙っていたんだ？ ⇨ Why have you been silent until now? Why you didn’t say anything earlier?
何故 [(1)なぜ] [liter] meaning: why rank: 1
☆ 人間は何故殺し合うのか ⇨ Why do humans kill each other?
☆ 何故そう思うのですか？ ⇨ Why do you think so?
何で [(1)なんで] [coll] meaning: why rank: 1
☆ 何でそんなことをしたの？ ⇨ Why did you do something like that?
☆ 何でそんなに怒ってるの？ ⇨ Why are you so angry?
☆ 何で遅れたの？ ⇨ Why were you late?
► 成句
何だって [(1)なんだって] [coll] [peer] meaning: why rank: 3
☆ 何だってそんなことしたんだ？ ⇨ Why in the world did you do something like that?