dumfounded vs dumbstruck

dumfounded and dumbstruck both are adjectives.

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

As adjectives, dumfounded and dumbstruck are synonyms defined as:

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

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

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