to break down the courage of completely, as by sudden danger or trouble; dishearten thoroughly; daunt: The surprise attack dismayed the enemy.

to surprise in such a manner as to disillusion: She was dismayed to learn of their disloyalty.

to alarm; perturb: The new law dismayed some of the more conservative politicians.

sudden or complete loss of courage; utter disheartenment.

sudden disillusionment.