Words Of Disappointment

noun a feeling of disappointment or disillusionment

verb to disappoint or fail to meet expectations

• The outcome of the project was a major letdown for the team.
• I was really looking forward to the concert, but it turned out to be a letdown.
• The movie was such a letdown, I was expecting so much more.
• His constant excuses were a letdown to our friendship.

adverb used to indicate that something is regrettable or unfortunate

preposition unfortunately can be used as a preposition in some cases to indicate a negative or unfortunate circumstance

• Unfortunately, the project was delayed due to unforeseen circumstances.
• I'm sorry to say that the concert has been canceled, unfortunately.
• Bummer, we can't go to the beach today, unfortunately.
• The dark clouds gathered overhead, unfortunately signaling the impending storm.