何 故(なぜ)か

なぜか

adverb

for some reason; somehow; inexplicably

1. for some reason; somehow; inexplicably

Indicates that the speaker cannot explain the reason for something. Expresses puzzlement about why a situation exists or an event occurred.

何故(なぜ)か涙(なみだ)が出(で)た。

For some reason, tears came out.

何故(なぜ)か彼女(かのじょ)は今日(きょう)機嫌(きげん)が悪(わる)い。

For some reason, she's in a bad mood today.

何故(なぜ)か分(わ)からないが、この場所(ばしょ)に来(く)ると心(こころ)が落(お)ち着(つ)く。

I don't know why, but I feel calm when I come to this place.

Usage

何故(なぜ)か is often written in hiragana as なぜか. It is placed at the beginning of a clause or sentence to express that the reason is unknown or unexplainable. It adds a nuance of mild puzzlement or wonder.

Common patterns

何故(なぜ)か分(わ)からないが… (I don't know why, but…)
何故(なぜ)か知(し)らないが… (I don't know why, but…)

Similar words

どういうわけか: for some reason (slightly more formal)
なんとなく: somehow, vaguely (softer, less puzzled)
不思議(ふしぎ)と: mysteriously, strangely

Related Words

Related: なぜ (base word)

Compare: どういうわけか (for some reason)

Compare: 何(なん)となく (somehow, vaguely)

general

Added 2026.3.7 22:43 · Revised 2026.9.2 13:01

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