say it: dis-uh-POYN-ting
disappointing is an adjective meaning "not up to expectations". It carries one recorded sense.
not up to expectations
“a disappointing performance from one who had seemed so promising”
Definitions, synonyms and semantic relations for disappointing 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.