astonishing vs stupefying

astonishing and stupefying both are adjectives.

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

As adjectives, astonishing and stupefying are synonyms defined as:

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

Other synonyms of astonishing include astounding, staggering.

astonishing (adjective)	stupefying (adjective)
so surprisingly impressive as to stun or overwhelm	shocking with surprise and consternation
surprising greatly	making physically stupid or dull or insensible
	so surprisingly impressive as to stun or overwhelm