From The Collaborative International Dictionary of English v.0.48 [gcide]:
Thunderstrike \Thun"der*strike`\, v. t. [imp. Thunderstruck;
p. p. Thunderstruck, -strucken; p. pr. & vb. n.
Thunderstriking.]
1. To strike, blast, or injure by, or as by, lightning. [R.]
--Sir P. Sidney.
[1913 Webster]
2. To astonish, or strike dumb, as with something terrible;
-- rarely used except in the past participle.
[1913 Webster]
drove before him, thunderstruck. --Milton.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
thunderstruck
adj 1: as if struck dumb with astonishment and surprise; "a
circle of policement stood dumbfounded by her denial of
having seen the accident"; "the flabbergasted aldermen
were speechless"; "was thunderstruck by the news of his
promotion" [syn: dumbfounded, dumfounded,
flabbergasted, stupefied, thunderstruck,
dumbstruck, dumbstricken]