stupefy
Meaning: to astonish, make insensible
Usage: Veronica’s audacity and ungratefulness stupefied her best friend, Heather.
flabbergasted
Meaning: astounded
Usage: I was flabbergasted when the quietest student won the debate tournament.
astound
Meaning: to amaze or greatly surprise
Usage: The magician’s final trick managed to astound the entire class.
dumbfound
Meaning: to make speechless with surprise
Usage: The sudden announcement seemed to dumbfound even the confident captain.
amaze
Meaning: to fill with wonder or surprise
Usage: The young pianist’s skill continued to amaze her teachers.