1. the feeling of sadness or displeasure caused by the nonfulfillment of one's hopes or expectations
2. a person, event, or thing that causes disappointment

Examples

• Her disappointment was obvious when she didn't get the job.
• The team's loss was a huge disappointment to their fans.
• To my disappointment, the concert was canceled.
• The movie was a disappointment after all the hype.
• He tried to hide his disappointment when he opened the gift.
• The restaurant turned out to be a real disappointment.
• She felt deep disappointment at not being chosen for the team.