say it: di-suh-POYN-ting-lee
disappointingly is an adverb meaning "in a disappointing manner". It carries one recorded sense.
in a disappointing manner
“the discoverer of argon, Sir William Ramsay, looked disappointingly ordinary”
Definitions, synonyms and semantic relations for disappointingly 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.