Synonyms of open-mouthed in English:

open-mouthed


See definition of open-mouthed

adjective

1‘they stare at us open-mouthed, as if we are completely insane’

SYNONYMS

astounded, amazed, in amazement, surprised, stunned, bowled over, staggered, thunderstruck, aghast, stupefied, dazed, taken aback, shocked, shell-shocked, in shock, nonplussed, speechless, dumbfounded, dumbstruck, tongue-tied, at a loss for words, agape, goggle-eyed, wide-eyed, staring

informal flabbergasted

British informal gobsmacked