いろいろな便利な - In some case, two na-adjectives linked not using で?


With my Japanese teacher, we study some text about Doraemon.

> 未来{みらい}の **いろいろな便利{べんり}な** 「ひみつ道具{どうぐ}」をポケットの中に持っている」

I was thinking **いろいろな便利{べんり}な** had to be **いろいろで便利{べんり}な**.




Yes, two ordinary na-adjectives are connected with で:

>   * きれいで清潔な部屋 (×きれいな清潔な部屋)
>   * 親切で元気な人 (×親切な元気な人)
>

Nevertheless, I feel 色々な便利な道具 is far more natural than 色々で便利な道具. 便利で色々な道具 is
okay but I feel this is still slightly odd.

I could not find an article which clearly explains why. But 色々 is unlike
normal na-adjectives in some ways:

  * It works as an adverb without に. 「いろいろ勉強した。」「いろいろ教えてください。」 [It even takes と](https://japanese.stackexchange.com/q/6037/5010).
  * Its attributive usage (i.e, modifying a following noun) is common, but its predicative usage is relatively uncommon and literary. We say 本棚に色々な本がある but 本棚にある本は色々だ sounds stiff. (If I understand correctly the English adjective _various_ is not used predicatively, either. "×The books are various." I don't know if it's a coincidence.)
  * It has a lexicalized [連体詞](https://japanese.stackexchange.com/a/1016/5010) version, namely [色んな](http://jisho.org/word/%E8%89%B2%E3%82%93%E3%81%AA), which is frozen and never conjugates. (×色んだ is incorrect)

So perhaps you can think of this 色々 as a special case where 色々な is always used
even when coupled with another adjective.




Yes, two ordinary na-adjectives are connected with で:

>   * きれいで清潔な部屋 (×きれいな清潔な部屋)
>   * 親切で元気な人 (×親切な元気な人)
>

Nevertheless, I feel 色々な便利な道具 is far more natural than 色々で便利な道具. 便利で色々な道具 is
okay but I feel this is still slightly odd.

I could not find an article which clearly explains why. But 色々 is unlike
normal na-adjectives in some ways:

  * It works as an adverb without に. 「いろいろ勉強した。」「いろいろ教えてください。」 [It even takes と](https://japanese.stackexchange.com/q/6037/5010).
  * Its attributive usage (i.e, modifying a following noun) is common, but its predicative usage is relatively uncommon and literary. We say 本棚に色々な本がある but 本棚にある本は色々だ sounds stiff. (If I understand correctly the English adjective _various_ is not used predicatively, either. "×The books are various." I don't know if it's a coincidence.)
  * It has a lexicalized [連体詞](https://japanese.stackexchange.com/a/1016/5010) version, namely [色んな](http://jisho.org/word/%E8%89%B2%E3%82%93%E3%81%AA), which is frozen and never conjugates. (×色んだ is incorrect)

So perhaps you can think of this 色々 as a special case where 色々な is always used
even when coupled with another adjective.

