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Why is 失礼 used here? And what function does に take?

> カラオケはあまり好きじゃありません。失礼の内容に断ってください。

First, I have no idea how the meaning „impoliteness“ should fit into this,
with which jisho.org provides me <http://jisho.org/search/shitsurei>  
Second, the “excuse” meaning was till now always connected to the verb suru
„失礼します“.  
Third, I don’t know how to meaningfully connect the phrase „失礼の内容“ to the verb
„断る“ via the particle に. It makes little to no sense in my opinion should 断る
take the meaning of „refuse“.  
„To inform“ could work, but I can’t remember that I would ever have seen the
particle に used in this way in such a context. Maybe „please inform (him/her)
in the impolite details“ ?  
I don’t know, I can’t beat sense into it.  
I think I know what the sentence wants to tell me, but I can’t properly
translate the sentence and therefore have no idea whether my vague
interpretation is correct or not…
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2017-07-07T16:33:15.583
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2017-07-11T03:21:13.583
2017-07-08T06:29:20.297
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question
grammar semantics
Problems with the function of に and the meaning of 失礼
As pointed out in the comments section, the ないように in your sentence means 無い様に,
not 内容に.

> カラオケはあまり好きじゃありません。失礼の **ないように** 断ってください。

"You don't really like Karaoke. ( _lit._ Please turn down the invitation in
such a way that there won't be rudeness/impoliteness ⇒) Please turn down the
invitation in such a way that you won't sound rude/impolite."

～のないように (＝ ～の(orが)無い様に) consists of: particle の + i-adjective ない + auxiliary
ようだ (ように is its continuative form/連用形), and means "so that there won't be..."
"in such a way that there won't be..." The 失礼 is a noun here.
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2017-07-08T06:40:20.123
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2017-07-11T03:21:13.583
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answer