Synonyms of open-mouthed in English:

open-mouthed

adjective

  • 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
    informal flabbergasted
    British informal gobsmacked
  • Definition of open-mouthed in:

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    Word of the day dinkum
    Pronunciation: ˈdɪŋkəm
    adjective
    (of an article or person) genuine, honest, true