何だか

なんだか · nandaka · JLPT N1 · adverb

somehow

何だか = 何 (what) + だ (is) + か (question): what-is-it, so somehow

Speakers use なんだか when they cannot pin down a feeling or reason, like a vague unease. Say nan-da-ka, letting か rise like a question, which matches the 'what is it?' origin.

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