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Assuming present tense, we can use i-adjectives in an attributive context both
in the affirmative form:

> 高い 椅子 が あります - there's an expensive chair

And in the negative form:

> 高くない 椅子 が あります - there's an inexpensive chair

* * *

I know we can use na-adjectives similarly in the affirmative form:

> 綺麗な 人 が います - there's a pretty person

But for the life of me I can't find any info on whether using na-adjectives in
the negative form is allowed in an attributive context (i.e. modifying a noun
rather than as a predicative with a copula). So is the following grammatical?

> 綺麗じゃない 人 が います - there's a non-pretty person
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2019-09-10T23:16:56.010
70728
2019-09-11T03:34:51.213
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negation na-adjectives attributive
Do na-adjectives have an attributive negative form?
Your guessed-at negative attributive is perfectly correct. The only caveat I'd
add is that じゃ is a somewhat-informal contraction for では, and thus you should
probably use the full では form in any formal spoken or written context.

> 綺麗[じゃ]{●}ない 人 が います  
>            ↓  
>  綺麗[で]{●}[は]{●}ない 人 が います

Happy studying!
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2019-09-10T23:33:15.317
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2019-09-10T23:33:15.317
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Although the name might scare people away,
[Japanesewithanime](https://www.japanesewithanime.com/2018/11/na-
adjectives.html?m=1#attributive-form) actually has a really in-depth post that
covers this topic. I'll just quote the relevant part discussing why your guess
was right, but there's a ton more information, so you might want to read
through it.

> The na of na-adjectives is actually a copula. The prenominal copula, or
> attributive copula.
>
> Basically, da だ is the copula you use in an independent clause, while na な
> is the copula you use in an attributive clause, also called adjectival
> clause. A clause that describes nouns.

But there isn't a negative form of な, so you have to go back to だ.

> The negative form of na-adjectives is literally just replacing the normal
> copula by a negative copula such as denai でない, dewanai ではない or its
> contraction, janai じゃない.

He includes a link talking about the difference in usage between [ではない and
でない](https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1363483578)
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