also: なにゆえに
adverb
why; how come
A slightly emphatic or literary way to ask 'why' or 'how come', more formal than なぜ. Often used in rhetorical questions or poetic contexts.
なぜにそんなことをしたのか、理解に苦しむ。
I can't understand why you did such a thing.
なぜに人は争うのか。
Why do people fight?
Derived from なぜ (why) with the particle に, adding emphasis or a literary tone. The reading なにゆえに is a more literal reading of the kanji 何故に.