disappointing

动词 disappoint:

1. fail to meet the hopes or expectations of
   同义词：disappoint, let down

形容词 disappointing:

1. not up to expectations
   同义词：dissatisfactory, unsatisfying

1. The film was built up to be a masterpiece, but I found it very disappointing.
   这部影片被吹捧为杰作，可是我觉得令人失望。
2. The weather was bad and the food dreadful. Altogether the holiday was very disappointing.
   天气又坏，吃的又糟. 总而言之，这次假日很扫兴。
3. Beside your earlier work this piece seems rather disappointing.
   这件工作同你早先的工作相比，有些令人失望。
4. Her exam results were disappointing but she tried to put a brave face on it.
   她的考试成绩令人失望，但却装出若无其事的样子。
5. It's disappointing!
   真令人失望！
6. The speech was most disappointing; it skirted round all the main questions.
   这篇演讲非常令人失望，它回避了所有主要的问题。

dis.ap.point.ing

adj.（形容词）
Not up to expectations:
使人失望的，令人扫兴的：没有达到期望的：
例句：
finished the marathon in a disappointing 2th place.
以令人失望的第十二名结束了马拉松赛跑

【引伸】
dis.appoint.ingly
adv.（副词）