dumbfounded

/dʌmˈfaʊndɪd/
adjective
  1. Extremely surprised or shocked, often unable to speak or react.
    • The scientists were dumbfounded by the unexpected results.
    • She looked dumbfounded after hearing the news of the lottery win.
    • He stood dumbfounded when he saw the damage to his car.
Antonyms
What does "dumbfounded" mean? | whatsthatwordmean | whatsthatwordmean