何故なぜ Common Adverb English jmdict 1 adverb (fukushi) word usually written using kana alone why;how;for what reason あなたはなぜ働いているの。 How come you're still working?
何故かなぜか Common Adverb English jmdict 1 adverb (fukushi) word usually written using kana alone somehow;for some reason;without knowing why 彼女はなぜかふさいでいる。 She looks blue for some reason.
Shirabe