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I know there is an adjective 「関係ない」 which is basically a noun + ない, but I
recently came across 「なしに」 in this sentence :

> 準備なしに発表した。

And I noticed that the に in なしに was making it act like an adverb. So I just
wanted to know if I can say :

> 準備なく発表した。

And if yes, what is the difference between なしに and なく?
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2017-03-01T21:59:43.310
43999
2017-03-02T23:47:51.210
2017-03-02T03:33:26.417
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question
word-choice adverbs
What is the difference between 「なく」 and 「なしに」?
> 準備なく発表した。  
>  is equal to  
>  "準備なしに発表した。"

The difference is so subtle that I can't explain it.

Examples

> 許可{きょか}なく出発{しゅっぱつ}した＝許可なしに出発した (without permission)  
>  十分なデータなく判断{はんだん}した＝十分なデータなしに判断した (without adequate data)  
>  誰にも知られることなく立ち去った＝誰にも知られることなしに立ち去った (without someone knowing about ...)

Thus "名詞+なく" is equal to "名詞+なしに," but there are exceptions.

There is an idiom "お構{かま}いなしに(without any regard to ...)," but we don't say
"お構{かま}いなく" as the same meaning.

Actually "お構いなく" has a different meaning.

> "How can I help you? (何かお困{こま}りですか？)"  
>  "Thank you, but no thank you. (いえ、大丈夫です。お構{かま}いなく)"
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2017-03-02T01:06:00.007
44002
2017-03-02T23:47:51.210
2017-03-02T23:47:51.210
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answer