flabbergasted vs stupefied

flabbergasted and stupefied both are adjectives.

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

As adjectives, flabbergasted and stupefied are synonyms defined as:

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

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

flabbergasted (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