say it: di-STUR-bing-lee
disturbingly is an adverb meaning "in a disturbing manner". It carries one recorded sense.
in a disturbing manner
“the details of the kidnaper's letter had sounded disturbingly convincing”
Definitions, synonyms and semantic relations for disturbingly come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.