Synonyms of open-mouthed in English:
they stare at us open-mouthed, as if we are completely insane
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
British informal gobsmacked
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