astounding vs stupefying

astounding and stupefying both are adjectives.

Word	Noun	Adjective	Verb	Adverb
astounding	No	Yes	No	No
stupefying	No	Yes	No	No

As adjectives, astounding and stupefying are synonyms defined as:

astounding and stupefying: so surprisingly impressive as to stun or overwhelm

Other synonyms of astounding include astonishing, staggering.

astounding (adjective)	stupefying (adjective)
so surprisingly impressive as to stun or overwhelm	shocking with surprise and consternation
bewildering or striking dumb with wonder	making physically stupid or dull or insensible
	so surprisingly impressive as to stun or overwhelm