1. To destroy the courage or resolution of by exciting dread or apprehension.
2. To cause to lose enthusiasm; disillusion: was dismayed to learn that her favorite dancer used drugs.
3. To upset or alarm.

Synonyms: These verbs mean to deprive a person of courage or the power to act as a result of fear or anxiety. Dismay is the least specific: Plummeting stock prices dismayed speculators.
Appall implies a sense of helplessness caused by an awareness of the enormity of something: "for as this appalling ocean surrounds the verdant land" (Herman Melville).
Daunt suggests an abatement of courage: "captains courageous, whom death could not daunt" (Anonymous ballad).
Horrify implies dread, shock, or revulsion: The citizens were horrified by the possibility of nuclear war.
To shake is to dismay profoundly: "A little swift brutality shook him to the very soul" (John Galsworthy). See Also Synonyms at fear.