letdown
let·down
noun
1.
a feeling of dissatisfaction that results when your expectations are not realized
- “his hopes were so high he was doomed to disappointment”
Origin
Deverbal from let down.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.