Synonyms:
* Disheartened: Feeling a loss of hope or courage.
* Dejected: Low in spirits; depressed.
* Discouraged: Losing confidence or enthusiasm.
* Appalled: Filled with horror or disgust.
* Horrified: Feeling intense fear or shock.
* Distressed: Suffering emotional pain or anxiety.
* Disappointed: Feeling let down or sad.
Antonyms:
* Encouraged: Feeling hopeful and optimistic.
* Elated: Feeling extreme happiness.
* Thrilled: Feeling intense excitement and pleasure.
* Jubilant: Feeling great joy and triumph.
* Relieved: Feeling a sense of freedom from worry or tension.
* Hopeful: Feeling optimistic about the future.
* Cheerful: Feeling happy and positive.
The best synonym or antonym to use will depend on the specific context in which you are using the word "dismayed."