In a way that disturbs, upsets, or causes concern; in a manner that is unsettling or worrying.
From the present participle disturbing (from disturb + -ing) + -ly adverbial suffix. This creates an adverb modifying entire clauses or other adjectives.
Notice that 'disturbingly' feels more natural than 'disturbedly'—this is because -ingly adverbs (from present participles) work better with abstract or psychological meanings, while -edly adverbs work better with visible states.
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