Simple:
* I was disappointed with the movie.
* He felt disappointed by her lack of effort.
More complex:
* Despite her best efforts, she was disappointed to discover that she hadn't made the team.
* The disappointed customer demanded a refund.
* His disappointment was palpable as he learned the news.
Figurative:
* Her heart sank with disappointment as she realized she had forgotten her phone.
* The empty street was a stark reminder of the disappointment of the cancelled festival.
Can you tell me what kind of sentence you're looking for? I can give you more specific examples if you tell me:
* The subject of the sentence (who is disappointed?)
* The reason for the disappointment
* The tone of the sentence (formal, casual, etc.)