disappoint       
verb [ I or T ] uk/ˌdɪs.əˈpɔɪnt/ us/ˌdɪs.əˈpɔɪnt/
B1 (使)失望,(使)沮丧
to fail to satisfy someone or their hopes, wishes, etc., or to make someone feel unhappy
  I'm sorry to disappoint you, but I'm afraid I can't come after all. 很抱歉让你失望,但恐怕我真的来不了。 
 We don't want to disappoint the fans. 我们不想让球迷们失望。 
 - More examples
 - Getting a B for that essay really disappointed me, as I was hoping for an A.
 - He failed to turn up for the concert, disappointing the crowds of fans waiting outside.
 - Now I'm expecting a fantastic performance from you tonight, so don't disappoint me!
 - I've promised my class cakes today as a treat and I don't want to disappoint them.
 - Have the actions of this government disappointed you, as someone who voted for them at the last election?