I am disappointed with the result of the competition
I feel disappointed with the result of the competition
I have disappointed with the result of the competition
- garlic2010Lv 78 年前最愛解答
The first two sentences are correct but the third one is not.
Disappointed, the past participle, is being used as an adjective in the first two sentences. I am disappointed and I feel disappointed are the same but I am disappointed is more common and natural.
Disappoint is a transitive verb. When used in an active voice, disappoint takes an object.
The movie has disappointed us.
Disappoint is also an intransitive verb, as in the following example.
His latest novel does not disappoint.