This is the 16138th most frequent Russian word.
разочаровать
To disappoint or disillusion.
In this sentence, 'разочаровать' is used to express the act of disappointing someone, implying that their expectations won't be met.
Я не хочу тебя разочаровать, но результата не получилось.
I don't want to disappoint you, but the result didn't come out.
Here, 'разочаровать' indicates anticipated disappointment, where one's actions could lead others to feel disappointed.
Ваши действия могут разочаровать команду.
Your actions might disappoint the team.
In this example, 'разочарует' (a form of 'разочаровать') is used to describe someone or something causing disappointment to an audience.