Why is 'ordinary book' translated as 普通の本 and not 普通な本


I have trouble understanding why "no" is used here instead of "na". For
example, on Tofugu they translate きれいな人 as "beautiful person" and きれいのヒント as
"beauty hints" or, basically "hints about beauty". In this vein, "futsuu no
hon" should mean something like "book about trivia/banality". Still, it is
translated as "(an) ordinary book". Is there something special about "futsuu"
that makes it behave as such?




Boundary between adjectival nouns (often called _na_ -adjectives) and pure
nouns is actually somehow fluent. Some words are used only with な, some words
are used only with の, and some words can be used with both of them.

Both "[普通](https://jisho.org/word/%E6%99%AE%E9%80%9A)の" and
"[普通](https://jisho.org/word/%E6%99%AE%E9%80%9A)な" are considered valid. The
former is used about 5 times more often according to Google.




Boundary between adjectival nouns (often called _na_ -adjectives) and pure
nouns is actually somehow fluent. Some words are used only with な, some words
are used only with の, and some words can be used with both of them.

Both "[普通](https://jisho.org/word/%E6%99%AE%E9%80%9A)の" and
"[普通](https://jisho.org/word/%E6%99%AE%E9%80%9A)な" are considered valid. The
former is used about 5 times more often according to Google.

