formal and informal language

[jamshid642002]

Which one is formal and which one is informal?

1.totally opposed to
2.throughly approve of
3.I'm all for
4.I'm a great supporter of
5.don't approve of
6. dead against
7.all for

[Avalon]

Hard to tell, but I´d say that numbers 3, 6 and 7 are informal while the others are more formal...

[Philly]

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Any of them could be used during a business meeting, for example. So, I wouldn't categorize them simply as "formal" vs "informal". Instead I'd just say that some tend to sound somewhat less formal/more informal than others. I agree with Avalon's take on things.
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Just a little additional spelling note: thoroughly
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