English version

slack-jawed

From Longman Dictionary of Contemporary Englishslack-jawedˈslack-jawed adjective  having your mouth slightly open, especially because you are surprised or stupid syn open-mouthed They looked at him, slack-jawed with disbelief.
Examples from the Corpus
slack-jawedThe inmates are stunned in slack-jawed amazement.She gasped repeatedly and Creed, goggle-eyed and slack-jawed, panted in time with her gasping.He looked out with an expression not yet of terror but of total, slack-jawed surprise.The audience sat slack-jawed with disbelief.
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