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I first came across it in a manga, in which office ladies discuss what their
boss' girlfriend would be like, and one of the guesses is:

> きっとすごい派手な女性とか？ オトナーな感じの？

My dictionaries turned up nothing, and searching for the term on the internet,
I found オトナーな下着、オトナーなかばん、オトナーなケーキ... I just couldn't figure out a pattern; I
thought it was "mature" at first, but a "mature cake" makes no sense. So what
does it mean? How come dictionaries haven't registered it?
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2021-03-08T22:04:26.770
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question
words na-adjectives
Meaning of オトナー as a な-adjective
オトナー is a play on 大人{おとな}, a noun literally meaning "adult", or "grown-up". It
is used as an adjective as well to mean "mature", "for adults", "like an
adult", "give off an adultish vibe".

「大人な下着」is underwear, especially women's underwear, that is suggestive,
possibly see-through or laced. I have also heard women describe black and red
underwear as 大人っぽい.

If you describe someone as 「大人っぽい」, especially if said of a teen, the image
conjured up is professional, office-lady-like. In your quoted line, the person
rumored to give off a vibe that's オトナーな感じ is not a teen, but the idea is the
same: a working professional, hence 「派手な女性」

Please also see @naruto's explanation of the different nuances of 「大人の」 and
「大人な」:

> Perhaps it's worth mentioning the nuance between 大人の and 大人な. The former is
> neutral and standard, whereas the latter is slangy and has stronger emphasis
> on matureness (often sexiness as well). 大人の下着 neutrally refers to underwear
> for adults, but 大人な下着 tends to refer to suggestive ones. 大人の女性 is neutrally
> 'adult woman', whereas 大人な女性 is a woman with a typically "adult" atmosphere.
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answer