Is there even 1 na-type adjective that can't be used as a real noun?


![enter image description here](https://i.stack.imgur.com/7zfaC.png)

The passage suggests that **not all na-type adjectives can be used as real
nouns** as shown in (b). It doesn't seem to be a case of careless choice of
words, since in the 2nd para, the passage uses "some" and in the 3rd para, the
passage uses "all", and there is an explicit contrast.

I was wondering why is it that not all na-type adjectives can be used as real
nouns. As far as I know, all na-type adjectives can be used as if they are
real nouns, like for example, this is grammatical right:

[code]

    特有は確かだ
    
[/code]

Is there even 1 na-type adjective that can't be used as a real noun as shown
in (b) (to prove that passage right) ?




If we are to follow how Japanese dictionaries classify them, we don't have to
worry about the fact **"not all na-type adjectives can be used as real
nouns"**. The Japanese dictionary lists `健康` as both 名詞 (noun) and 形容動詞 (na-
adjective) so that's why it can be used as a noun. On the other hand, `確か` is
not listed as noun, therefore it cannot be used as a noun. One more example is
`きれい`.

* * *

Previously I used [dic.yahoo.co.jp](http://dic.yahoo.co.jp) or
[dictionary.goo.ne.jp](http://dictionary.goo.ne.jp). Now maybe I recommend
[Weblio](http://www.weblio.jp/). It also has bidirectional English-Japanese
dictionary ([other screenshot](https://i.stack.imgur.com/S2VoE.png)). ![The
Sanseid entry for たしか in Weblio](https://i.stack.imgur.com/JFygy.png)




If we are to follow how Japanese dictionaries classify them, we don't have to
worry about the fact **"not all na-type adjectives can be used as real
nouns"**. The Japanese dictionary lists `健康` as both 名詞 (noun) and 形容動詞 (na-
adjective) so that's why it can be used as a noun. On the other hand, `確か` is
not listed as noun, therefore it cannot be used as a noun. One more example is
`きれい`.

* * *

Previously I used [dic.yahoo.co.jp](http://dic.yahoo.co.jp) or
[dictionary.goo.ne.jp](http://dictionary.goo.ne.jp). Now maybe I recommend
[Weblio](http://www.weblio.jp/). It also has bidirectional English-Japanese
dictionary ([other screenshot](https://i.stack.imgur.com/S2VoE.png)). ![The
Sanseid entry for たしか in Weblio](https://i.stack.imgur.com/JFygy.png)

