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Admittedly is an adverb.
Admittedly, this may be a trick question, but I shall endeavor to provide the answer, none-the-less.
I think it is an adverb
I think it's admittedly.
He was fond of peas but not fond of spinach.
He was not found of homework, but loved reading novels.
As the opposite of fond, "not fond" means it isn't something you find pleasant or exciting.