Collocations for disappointed - adj.

be, feel, look, seem, sound
leave sb
The decision left them very disappointed.

extremely, fairly, very, etc.
bitterly, deeply, desperately (BrE), greatly, hugely (esp. BrE), sadly, sorely, terribly
I was bitterly disappointed when I didn't get into college.
If you think I'll agree to that, then you're going to be sadly disappointed.

almost
He seemed almost disappointed when I agreed to go.

a little, slightly, etc.
mildly
clearly, obviously
visibly
genuinely
Jerry sounded genuinely disappointed.

about
I'm disappointed about John not coming.

at
They're disappointed at the result.

by
I was slightly disappointed by her attitude.

in
He's disappointed in his daughter.

with
We're disappointed with the new car.

Disappointed is used with these nouns:
expectation, look