dumbfounded vs stupefied

dumbfounded and stupefied both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dumbfounded	No	Yes	No	No
stupefied	No	Yes	No	No

As adjectives, dumbfounded and stupefied are synonyms defined as:

dumbfounded and stupefied: as if struck dumb with astonishment and surprise

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

dumbfounded (adjective)	stupefied (adjective)
as if struck dumb with astonishment and surprise	in a state of mental numbness especially as resulting from shock
	as if struck dumb with astonishment and surprise