Etymology
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astounding (adj.)

"stunning," 1580s, present-participle adjective from astound (v.). Related: Astoundingly.

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Definitions of astounding

astounding (adj.)
bewildering or striking dumb with wonder;
Synonyms: dumbfounding / dumfounding
astounding (adj.)
so surprisingly impressive as to stun or overwhelm;
an astounding achievement
Synonyms: astonishing / staggering / stupefying
From wordnet.princeton.edu