astounding vs astonishing

astounding and astonishing both are adjectives.

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

As adjectives, astounding and astonishing are synonyms defined as:

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

Other synonyms of astounding include staggering, stupefying.

astounding (adjective)	astonishing (adjective)
so surprisingly impressive as to stun or overwhelm	so surprisingly impressive as to stun or overwhelm
bewildering or striking dumb with wonder	surprising greatly