failing to fulfil someone's hopes or expectations 令人失望的 the team made a disappointing start. 这个队一开始就让人失望。 [with clause]it was disappointing that there were relatively few possibilities. 令人失望的是相对而言可能性很少。
派生 disappointingly adverb
变化令人失望地少 [as submodifier]there was disappointingly little change. 令人失望的是,我的德语未能有所长进。