/thun"deuhr struk'/ , adj.
1. overcome with consternation; confounded; astounded: He was thunderstruck by the news of his promotion.
2. Archaic. struck by a thunderbolt.
Also, thunderstricken /thun"deuhr strik'euhn/ .
[ 1605-15; THUNDER + STRUCK ]
Syn. 1. dumbfounded, flabbergasted, overcome.