slack-jawed
Longman Dictionary of Contemporary English 5++LDOCE 5++ˈslack-jawed adjective having your mouth slightly open, especially because you are surprised or stupid 微张着嘴的〔尤因吃惊或愚蠢〕 SYN open-mouthed They looked at him, slack-jawed with disbelief. 他们张着嘴，难以置信地看着他。
Examples from the Corpus
slack-jawed• The 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.ˈslack-jawed adjectiveChineseSyllable
your slightly you because open, Corpus mouth especially having
slack-jawed
ˈslack-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.
ˈslack-jawed
adjectivehaving your mouth slightly open, especially because you are surprised or stupid
SYN open-mouthed: