1. (

• dumbfounded ,
• dumfounded ,
• flabbergasted ,
• stupefied ,
• thunderstruck ,
• dumbstruck ,
• dumbstricken

) as if struck dumb with astonishment and surprise; "a circle of policemen stood dumbfounded by her denial of having seen the accident"; "the flabbergasted aldermen were speechless"; "was thunderstruck by the news of his promotion" ;