1. Dumfounded, To fill with astonishment and perplexity; confound.

2. Synonyms for Astounded include astonished, shocked, stunned, dumbfounded, flabbergasted, alarmed, amazed, awestricken, awestruck and dumfounded

3. 22 At that moment, I was so dumfounded that my only reaction was to slam the door and rush out.

4. Astounding: 1 adj bewildering or striking dumb with wonder Synonyms: dumbfounding , dumfounding incredible , unbelievable beyond belief or understanding adj so surprisingly impressive as to stun or overwhelm “an Astounding achievement” Synonyms: astonishing , staggering , stupefying impressive making a strong or vivid impression