“Without knowing why” in Japanese
Short answer
Without knowing why in Japanese is “何故か” (nazeka). Full meaning: somehow, for some reason, without knowing why.
Other ways to say “Without knowing why” in Japanese
漫ろに
sozoroni in spite of oneself, somehow, without knowing why, vaguely
何かしら
nanikashira somehow (or other), for some reason, without knowing why; something (or other), some ... or other
何となく
nantonaku somehow or other, for some reason or another, without knowing why
何故だか
nazedaka somehow, for some reason, without knowing why
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