dumbstruck vs flabbergasted

dumbstruck and flabbergasted both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dumbstruck	No	Yes	No	No
flabbergasted	No	Yes	No	No

As adjectives, dumbstruck and flabbergasted are synonyms defined as:

dumbstruck and flabbergasted: as if struck dumb with astonishment and surprise

Other synonyms of dumbstruck include dumbfounded, dumbstricken, dumfounded, stupefied, thunderstruck.

dumbstruck (adjective)	flabbergasted (adjective)
as if struck dumb with astonishment and surprise	as if struck dumb with astonishment and surprise