"I could see the dismay on her face when she learned of the death." I think
He was dismayed at the thought of not seeing them again.
They were not, however, dismayed by the news. The above sentence required two commas.
John's parents were dismayed at his willful misconduct. Julie's actions were willful and disregarding other people's feelings.
She was dismayed at the injustice of his remark. Jack spends his evenings contemplating life's injustices
Downcast and dismayed, Danny felt quite dejected when dumped by his girlfriend.
YES. Their reaction dismayed him. It can also be an adjective: He was dismayed at the change in his old friend.
there has been an avalanche. a skier was killed by the avalanche the secretary was dismayed by the avalanche of letters that fell on her as she entered her study.
was dismayed to find that his partners political credit not good
There is no plural form for the noun dismay. Dismay is a state of being, you are either in that state or you are not. When you need to say that a number of people are in the state of dismay, you use the adjective form, the dismayed people, or the verb form, they were dismayed.
No, it isn't.
pleasant surprise
Gladdened.