Is "so" an adverb in "She's so unusual?"

[Zoli]

I'm talking about Cyndi Lauper's album "She's so unusual." I was wondering what part of speech is "so". I don't think it's a preposition but I would like to know your opinion. Thank you so much.

 

[emsr2d2]

I'm talking about In the title of the Cyndi Lauper 's album "She's So Unusual no full stop here" I was wondering what part of speech "so" is. "so". I don't think it's a preposition but I would like to know your opinion.

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It's an adverb, modifying "unusual".