動詞 disappoint:

1. fail to meet the hopes or expectations of
   同義詞：disappoint, let down

形容詞 disappointing:

1. not up to expectations
   同義詞：dissatisfactory, unsatisfying

1. The film was built up to be a masterpiece, but I found it very disappointing.
   這部影片被吹捧為杰作，可是我覺得令人失望。
2. The weather was bad and the food dreadful. Altogether the holiday was very disappointing.
   天氣又壞，吃的又糟. 總而言之，這次假日很掃興。
3. Beside your earlier work this piece seems rather disappointing.
   這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.
   她的考試成績令人失望，但卻裝出若無其事的樣子。
5. It's disappointing!
   真令人失望！
6. The speech was most disappointing; it skirted round all the main questions.
   這篇演講非常令人失望，它回避了所有主要的問題。

dis.ap.point.ing

adj.（形容詞）
Not up to expectations:
使人失望的，令人掃興的：沒有達(dá)到期望的：
例句：
finished the marathon in a disappointing 2th place.
以令人失望的第十二名結(jié)束了馬拉松賽跑

【引伸】
dis.appoint.ingly
adv.（副詞）