adverb
modifies a verb, adjective, or another adverb, indicating the manner in which something is done; in this case, 'surprisingly' modifies the verb or action being described
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Surprisingly, the experiment yielded results that were completely unexpected.
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I was surprisingly pleased with how the movie turned out.
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I surprisingly aced the test without even studying.
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Her talent on the piano was surprisingly like that of a professional musician.