pre-noun adjectival
what; what kind of; what sort of
Pre-noun adjectival used to ask about the nature, type, or identity of something. Followed directly by a noun.
これは何の本ですか。
What kind of book is this?
何の用事で来たのですか。
What business brings you here?
pre-noun adjectival
no ...; any
Used with a negative sentence to mean 'no ... at all' or 'not any'. Emphasizes the absence of something.
彼の話には何の根拠もない。
There is no basis at all for his story.
何の問題もありません。
There aren't any problems.
pre-noun adjectival
adds emphasis to the preceding word
Used in the pattern ...のなんの to emphasize the preceding word, often in a dismissive or exaggerated way. Usually written in kana.
痛いのなんのって、もう立てないよ。
It hurts so much I can't even stand up.
彼は忙しいのなんのと言って、全然手伝ってくれない。
He keeps saying he's busy and won't help at all.
interjection
no; not at all; oh (it's nothing)
Interjection used to dismiss someone's concerns, words, or thanks, implying 'it's nothing' or 'don't mention it'. Usually written in kana.
「手伝ってくれてありがとう。」「なんの、なんの。」
"Thanks for helping." "Oh, it was nothing."
「大丈夫?」「なんの、これくらい
"Are you okay?" "No problem, this is nothing."